Time bomb

Put some cards face up and on the back put numbers.  On some of the cards, but a picture of a bomb (or another scary thing like a demon or ghost).  Tell the kids how many "scary things" there are.  They take turn in saying and taking a card.  If it is a number they keep it.  If it is a bomb, all the cards they collected so far are confiscated along with the bomb and the game continues.  The player with the most points at the end wins.

For big groups, do it on the board with big cards and split the kids into two groups.