household chores!

bathroom.

you have two brushes: a BIG nice new one and a used toothbrush (which is small, given the size of my teeth). you can only use one.

................you thought the big nice new brush would compliment the bottle of scrub cream soap. moreover, it'd take less time. you brushed, you brushed, and you brushed while humming "..i'm on the top of the world overlooking down on creation.. lalala i'm the world's greatest" and voila. you thought you were done. you thought what a wonderful job you had done. you thought it was all squeaky clean.

[...but hey. not at all.]