jack-in-the-box

Short definition from Wiktionary

Noun

1. 1
   Children’s toy consisting of a small box from which a male figure pops out unexpectedly after some turnings of a crank.
2. 2
   A small but powerful kind of screw, used by burglars to break open safes.
3. 3
   A con-man who deceived tradesmen by substituting empty boxes for others full of money.