Sheldon playing with his Train
Thought and Imagination
How many likes for Shamy?
Penny:It's actually kind of nice. You reading, me reading. We're like an old married couple.
Sheldon: If we were an old married couple, the wife would serve iced tea...
Season 5 Episode 02 – The Infestation Hypothesis
Season 3 Episode 13 – The Bozeman Reaction
What's your Zombie Apocalypse Team?
Season 6, Episode 1 "The Date Night Variable"