They do call it a pit stop. But Jen (of Kisha and Jen) couldn’t make it to the mat in Sunday night’s next-to-last episode without stopping at a Beijing public toilet for a pit stop of her own. The potty break made her a punchline for future “Amazing Race” humor — and cost her and her sister a chance to race for $1 million in next Sunday’s finale. It was funny and entertaining, especially because they were dressed in Beijing Opera costumes at the time, but also sad, because the sisters would have been real contenders in the finale. Of the final four teams, they were the strongest and most athletic, and I wouldn’t think carrying the pig at the luau (as seen in the previews) would have caused them too much of a problem. Not that I’d ever be in an “Amazing Race,” but I really think that for a chance at half of $1 million, I’d wet my pants. I mean: Wouldn’t you?