7. Cee-Lo Green
US R&B singer Cee-Lo Green appears as the "evil hot tub" in the season 7 episode 'Hot Water' after a stressed out Stan goes shopping for hot tubs and is attracted to a used machine in a store room. Despite salesman Marguerite's efforts to talk Stan out of buying it, he does anyway, and becomes strangely obsessed with the hot tub, spending most of his time in it, much to Francine's annoyance. When Francine gives Stan an ultimatum - it's her or the hot tub - Stan picks the hot tub and his wife packs her bags and leaves. The Hot tub is voiced by Green, who also appears in live-action as the episode narrator. Green is famous for such hits as "Crazy" and "Forget You".