I was in a taxi at a stoplight. Usually beggars and people selling things come up at stoplights and try to engage you. And the windows are always open because it's too hot to shut them.
Unexpectedly, I had a cobra shoved in the window at me! There are men who take them around places, show them (somehow it 'blesses' you) and then you're supposed to give them money.
I had carefully memorized the phrase, "Not my custom," in the language to calmly say on just such an occasion. But did I remember that in the heat of the moment? Nope! The only thing I could remember how to yell was, "No, snake! No, snake! Go away”