A porcupine has its pricks on the outside
So she could know what it's like to have a prick inside her.
Porcupines have pricks on the outside.
King Kong in clingfilm
A: The Outside.
A. With a porcupine, the pricks are on the outside.
A BMW's pricks are on the inside!
Watching your mother-in-law backing up towards the edge of a cliff in your new BMW.
Rust-in-peace.