Last night's 30 Rock , " Sandwich Day, " was, as usual, a triple-watcher (lately I've been triple-watching by rewinding each scene and watching it twice, then watching the entire episode for a third time, but that's just a pro-tip: each person should figure out the 30 Rock multiple viewing system that works for him or her). Liz tried to impress her ex, Floyd, while a displaced Jack moved to ...