The Excelsior Acquisition
Sheldon winds up in traffic court when he gets a ticket because of Penny.
The Cushion Saturation
A paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.
The Peanut Reaction
Penny wants to throw a surprise party for Leonard, but Sheldon's indulgence at an electronics store throws her off-track.
Carpet Diem
The twins discover a hidden room inside the Mystery Shack and compete over who should have it.