The party finds a secret door. Not knowing what’s on the other side, they send the fighter in first. The fighter pushes open the secret door. As it swings forward it pushes aside a corpse on the other side that apparently died trying to pry open the secret door and escape from the next room.
The fighter steps over the corpse, walks into the room, looks around, sees there are no enemies immediately attacking him, and says to the rest of the party “come on in guys, looks like it’s safe in here!”
Absolutely. As the saying goes: you have to give the players just enough rope to hang themselves.
As you become more cynical you start selling them the rope.