Dutch uncle is a term for a person who issues frank, harsh, and severe comments and criticism to educate, encourage, or admonish someone. Thus, a "Dutch uncle" is a person who is rather the reverse of what is normally thought of as avuncular or uncle-like (which would be indulgent and permissive).
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*too good to be true 
almost unbelievable; so good as to be unbelievable.  The news was too good to be true. When I finally got a big raise, it was too good to be true. 
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
too good to be true 
not to be believed or likely to be real They told me I'd be going on business trips to Europe, but it sounded too good to be true. 
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1-402 Academic Integrity Infractions
a. Cheating. No student shall use or attempt to use in any academic exercise
materials, information, study aids, or electronic data that the student knows or
should know is unauthorized. Instructors are strongly encouraged to make in
advance a clear statement of their policies and procedures concerning the use
of shared study aids, examination files, and related materials and forms of
assistance. Such advance notification is especially important in the case of
take-home examinations. During any examination, students should assume
that external assistance (e.g., books, notes, calculators, and communications
with others) is prohibited unless specifically authorized by the Instructor. A
violation of this section includes but is not limited to:

1. Allowing others to conduct research or prepare any work for a student
without prior authorization from the Instructor, including using the services
of commercial term paper companies.

2. Submitting substantial portions of the same academic work for credit more
than once or by more than one student without authorization from the
Instructors to whom the work is being submitted.

b. Plagiarism. No student shall represent the words or ideas of another as one’s
own in any academic endeavor. A violation of this section includes but is not
limited to:

1. Copying: Copying another student’s paper or working with another person
when both submit similar papers without authorization to satisfy an
individual assignment.

2. Direct Quotation: Every direct quotation must be identified by quotation
marks or by appropriate indentation and must be promptly cited. Proper
citation style for many academic departments is outlined in such manuals
as the MLA Handbook or K.L. Turabian’s A Manual for Writers of Term
Papers, Theses and Dissertations. These and similar publications are
available in the University bookstore or library. The actual source from
which cited information was obtained should be acknowledged.

3. Paraphrase: Prompt acknowledgment is required when material from
another source is paraphrased or summarized in whole or in part. This is
true even if the student’s words differ substantially from those of the
source. A citation acknowledging only a directly quoted statement does not
suffice as an acknowledgment of any preceding or succeeding paraphrased
material.

4. Borrowed Facts or Information: Information obtained in one’s reading or
research that is not common knowledge must be acknowledged. Examples
of common knowledge might include the names of leaders of prominent
nations, basic scientific laws, etc. Materials that contribute only to one’s
general understanding of the subject may be acknowledged in the
bibliography and need not be immediately cited. One citation is usually
sufficient to acknowledge indebtedness when a number of connected
sentences in the paper draw their special information from one source.

c. Fabrication. No student shall falsify or invent any information or citation in an
academic endeavor unless authorized to do so by the Instructor. A violation
of this section includes but is not limited to:

1. Using invented or false information in any laboratory experiment or other
academic endeavor without notice to and authorization from the Instructor
or examiner. It would be improper, for example, to analyze one sample in
an experiment and covertly invent data based on that single experiment for
several more required analyses.

2. Altering the answers given for an exam after the examination has been
graded.

3. Providing false or misleading information for the purpose of gaining an
academic advantage.

d. Facilitating Infractions of Academic Integrity. No student shall help or attempt
to help another to commit an infraction of academic integrity, where one
knows or should know that through one’s acts or omissions such an infraction
may be facilitated. A violation of this section includes but is not limited to:

1. Allowing another to copy from one’s work.

2. Taking an exam by proxy for someone else. This is an infraction of
academic integrity on the part of both the student enrolled in the course
and the proxy or substitute.

3. Removing an examination or quiz from a classroom, faculty office, or other
facility without authorization.