Tongue twisters are pretty much guaranteed to make you smile no matter what age you are. The entire tongue twister about sea shells goes like this, "She sells seashells by the seashore. The shells she sells are surely seashells. So if she sells shells on the seashore, I'm sure she sells seashore shells." Did you know: There's an equivalent to tongue twisters in sign language, referred to as "finger fumblers".