You do a bathos in an email.
You include a crude joke at the end of a very professional email. Why is it a bathos?
…
A bathos is a switching from talking or writing in a high class way… to a low class way.
It ruins the image you were presenting.
http://www.englishionary.com/B/Bathos.htm
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may i know what kind of folks is that?
intermediate leval