Ruin a quote by attributing it to the wrong person.
"Don't cry because it is over. Smile because it happened." -Adolf Hitler, 1945.
Alright, Matty, listen up! You think it's funny to put a nice quote next to Hitler's name? You probably think that's just wacky. The joke here is that the quote is all positive and kind of wise, which is the opposite of what you think of when you think of Hitler. It's like, imagine a cute puppy doing something horrible. That's how off-the-wall it is when you put that quote with that name. The joke is based on misattribution, which is another way of saying you messed up the source. That’s all there is to it, don't overthink it.