Ants on a Log and a Cheating Winker - S7-E4
Other mistake: Sheldon (in the voice-over) says "it really brought what's his name and I closer together." The grammatically correct expression is "brought what's his name and ME closer together", and a stickler like Sheldon would not make that mistake.
Answer: Mary is highly religious and completely against any form of alcohol as shown in Big Bang Theory numerous times.
Ssiscool ★