A blonde, a brunette, and a redhead are in Magical Fairyland.
They are crossing an enchanted bridge when they run into a fairy. The fairy says that they can be granted a transformation if they jump off the bridge and call out their wish.
The redhead jumps off the bridge and yells out “Salmon!” She turns into a gorgeous shimmering salmon and swims upstream to spawn.
The brunette immediately jumps off the bridge and yells “Eagle!” She turns into a beautiful bird of prey and flies away.
The blonde is at this point so excited that she jumps off the bridge without thinking of her wish.
She panics. “Crap!”
This joke is included in the Black Book of Jokes. You can order it from here.