The porcupine's pricks are on the outside.
You can't hear a protein. (Wait for it)
A golfer goes "Whack, crap!", and a skydiver goes " Crap, whack!".
The Earth's crust is on the outside.
A cactus has all the pricks on the outside.
With the porcupine, the pricks are on the outside.
Original ) A Porcupine!
Mercedes Benz...