Ahem. ATTENTION ALL MERCURY EMPLOYEES: According to SCIENTIFIC RESEARCH as reported by the Daily Mail:

An hour of pushing a mop across the floor and wringing it out in a bucket works off 238 calories, the equivalent of a chocolate bar or two small glasses of wine.

The mop and bucket are in the supply closet, fatty. And pay special attention to my personal bathroom—there's a lot of urine splatter on the floor.