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					Originally Posted by laepelba  I slurp my tea. (I can imagine my mother yelling at me for being so rude.)You slurp your tea. (I'll bet you do!)
 He slurps his tea. (What's so irregular about that?)
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 It's a 
joke 
 when the verb is something uncomplimentary. Often, people judge things differently when they themselves, their friend, or someone unknown are doing the same things: for example, an irregular verb 
to be drunk
 
I whet my whistle
You partake of alcohol
He/She drinks like a fish
 
Like a lot of jokes, it's not funny when explained. 
 
 