Every time Leonard comes back from dinner, which episode is Sheldon's neurotic question?

Season 3 episode 10 gorilla experiment: Howard took Bernadette to SL's house to show off, and B and Leonard discussed the physics experiment, but Penny didn't understand, so Penny asked Sheldon to teach her physics privately, which finally surprised everyone; At the same time, Howard was jealous and angry that Leonard allowed his girlfriend to visit his lab. After learning about this, B thought Howard was unreasonable, but they soon made up (a couple who really appreciated each other).