So the rogue of our party had an invisibility cloak. He once used it to sneak into a room full of bugbears and the proceeded to steal from them. 

Although he rolled high our dm goes “ yeah they are 5 bugbears so they suddenly see a hand come out of nowhere and stealing the pouch”. 

While the bugbears were trying to find him, he rushed to the door. He swung it open exposing the rest 3 of us. 

Dm: good job you, the rogue, just eXPOSED YOUR WHOLE PARTY WELL DONE