Urine, restaurant mop buckets, celebrated presidents. All adds up to a child's rite of passage.

Oh hi, Justin Bieber! Seems like it's been ages since you've behaved like an undersupervised, late-blooming nightmare! You've been missed.

TMZ just released the video below of Justin Bieber having free reign of a restaurant kitchen, making for a really gross and unsanitary version of the Goodfellas Copacabana entrance.

See, they just wanted to give everyone on the staff something to remember him by, and there's no better sense memory of an encounter with Justin Bieber than the odor of a bucket of piss. Not sure why he came at Bill Clinton like that. Maybe he just heard that Bill was behind the whole Defense of Marriage thing in the first place.

Sources: TMZ