Oh, yeah, I don't know if this is a prank, but it's kinda funny.
One day, my friend was sitting next to me in class, and said,
"If you say 'gullibe' reeeeally slowly, it sounds like 'green beans'."
I thought about it, and it didn't sound like it to me; I didn't get the joke.
Then she called the teacher and told her the same thing.
Sure enough, the teacher said with the most serious face, "Gul-li-ble..... Oh! That's mean!"
Then, I said, "Oh! I get it, now!" then I laughed.
That day, after school, when I saw her, I said, "That's okay, 'gullible' isn't even in the dictionary, anyway."
She said, "It's not?"
I told her, "Yeah, and neither is 'sarcasm'."
I made a run for it.