And he lowered the lantern until it rested on the very rim of the powder keg.
Stand back there or I'll drop a lighted match into a powder keg!
Without knowing, we are sitting on a powder keg in which the fuse may or may not be lighted.
I was afraid I had said good-bye when you were left with that powder keg.
She did not try to carry the powder keg, but she took the powder ...