VIDEO: The Britney Spears Jackass Stunt You Never Saw

Britney Spears was all over last night's Jimmy Kimmel Live!, popping up in no fewer than three separate segments. The most memorable occurred during Johnny Knoxville's couch time, when the professional masochist played a supposed deleted scene from Jackass 3-D. In it, Brit undergoes the "poo cocktail supreme," a gag-worthy gag that involves rigging a used Porta-Potty up to a giant slingshot and letting it -- and its contents -- fly. With no clear shot of her face after she's strapped in, it seems obvious they used a body double here. Those who thought they'd finally get the chance to see her doused in feces and urine will be bitterly disappointed.

Watch Britney say bizarre things in the promo for her upcoming MTV doc.