“I found this black, comb-like plastic thing in my car. It’s just over an inch long. I have no idea where it comes from, or what it is.”
Answer: "It’s a surfboard wax comb. It usually comes attached to the inside back pocket of board shorts on a little tether."
Could it be the picture is upside-down?
"Tastes like lime..." I'm more concerned that the person would taste something that they don't know what it is (the answer is probably correct but still...)