booby trap

noun
1
a hidden bomb that explodes when the object that it is connected to is touched
تله انفجاری, تله بمب, بمب تله‌ای
2
a hidden device that is meant as a joke to surprise somebody, for example an object placed above a door so that it will fall on the first person who opens the door
تله خنده‌دار, تله غافلگیرکننده, تله شوخی