Chest of Destruction (trap idea)
Here's one for you DM's that want a chest trap to cause major damage to those who don't check for traps. The players have just beaten a relatively easy enemy group of enemies, & are presented with a rather large sized chest. When they open it they will find that it doesn't have a lock & is infact full of gold coins. However if they pick up more than 10 gold coins without checking for a trap, they will hear a *click* sound. If the people within 10 feet of the chest, don't dodge, they will take 2d10 damage. If they do dodge, make them roll a dex check & on a fail they take 2d10 damage. If they check the chest beforehand for traps, they will find a pressure activated trap, or more accurately, a lack of pressure activated trap.