Friday was April Fools' Day and at my school I made a fake test for English teachers ( I teach English in Taiwan) that had insane made-up grammar questions (like "change these sentences to either past intensive tense or adverbial clause tense" etc) but I let some in so that the more gullible ones would feel even worse as the ones who were in on it could do it quickly and say it was no problem.
I also asked my boss (who's Taiwanese) to come in and tell one teacher ( who is of Taiwanese descent but raised in Iowa) that the government would be sending an official soon to pick up the tests and may ask her questions, so this teacher would have to pretend to be fully Taiwanese. So the boss acted nervous and told her the school may get shut down and that this teacher could get deported if she doesn't convince the official that she's fully Taiwanese. So the boss is quickly trying to drill an overly-long sentence in mandarin into this teacher while she's trying to finish the fake test.
Then the "government official" came in (who was really a secretary from another department) and asked this teacher some questions, making her very nervous and she barely got the sentence out.
Once the official left I got to tell her it was April Fools'. I wish I'd brought my camera.