They never expect a ring
Stealing candy from a dead baby.
Two test-tickles.
They work on so many levels
The execution
If you like dialogue, theres a whole lot of Tolkein.
Give me a ring sometime.
Two Wongs don't make a white
irony irne/ noun a state of affairs or an event that seems deliberately contrary to what one expects and is often amusing as a result.
She wouldn't let his ravenclaw slytherin her Gryffindor.
Split the bill.