Joe definitely takes top prize in the GCOW (garbage can on wheels) contest.
Oh, you weren't aware there was one?
Entry is easy.
Buy a car.
Have some kids.
Let said kids ride in car...and eat/poop/litter.
Take up a messy hobby (triathlon is highly recommended. Lots of paraphernalia and even more dirt.) But any legitimate messy interest will do.
Don't clean car. Ever. Even when your significant other calls you "gross". Especially then.
Check out how awesome Joe is doing here. I've certainly got my work cut out for me. My two inches of goldfish/raisin sludge on my floor mats just aren't cutting it anymore.