Magnetic Bird Poop

I've seen quite a few bikes with bullet hole stickers on the fenders. Personally, I don't care much for them, but I can understand that other folks see them as "cool" or like a parody of something.

But, I just don't understand bird poop stickers. Actually, these are magnets. I don't think any biker would put these on their bike, and I don't see anyone putting them on their cage.

But it would be a great gag to pull on one of your buddies!