extra toothbrush
Roommate 1: "I found an unused, extra toothbrush!"
Roommate 2: "Keep it for drunk guests who can't find their toothbrush during State Patty's weekend."
Roommate 1: "It's
one of those things that would be useful if only you can find it when
you need it."
Roommate 2: "Yep, it's
one of those usefulless stuff..."