Night. A sleeping couple is lying in a bed. Door bell rings. A couple wakes up. Woman: "Quick! My husband is back!" Man jumps out from a window. Flying down he starts to think: "Shit! But I am the husband!"
Snails produce a colorless, sticky discharge that forms a protective carpet under them as they travel along. The discharge is so effective that they can crawl along the edge of a razor without cutting themselves.