A redhead, a brunette and a blonde took swimming classes.
"Ok, I'm going to start you guys off with the Breaststroke. Go!" said the instructor. They all jumped in the pool. The brunette finished first, and the redhead finished second. 30 minuets later the blonde finally reached the end of the pool.
"Why did you take so long?" asked the instructor. "Are you kidding me?" said the blonde. "The brunette was cheating, she was clearly using her arms!"
How do you drown a blonde? Put a scratch and sniff sticker at the bottom of a pool.