The Justice League Recombination
Season 2 Episode 02 – The Codpiece Topology
Penny: Oh, gee, well, thankyou for that. But, um, I think for now Leonard and I are just going to stay friends.
Sheldon: No, that response is unacceptable to me.
Soft Wookiee, warm wookiee...
Season 6 Episode 11, "The Santa Simulation"
Season 3 Episode 01 – The Electric Can Opener Fluctuation
Season 1, Episode 7, "The Dumpling Paradox"