Pretty much everything Trish says, especially when she yells out "sex tiebreaker!"... within earshot of kids.
Tuck and FDR bickering with each over the flaws Lauren mentioned them having (FDR's girlish hands, and Tuck being British)
Tuck screwing with FDR's headset while he's out with Lauren and feeding him bad lines.
FDR is faking that he works at an animal shelter, so he tries to pick up a seemingly cute dog, only to get violently attacked by it.
The two watch Trish and Lauren talk:
Tuck: ...why's she talking to that old man?
FDR: I have no idea.
FDR making fun of Tuck's general Britishness.
FDR and Tuck's Mission Controls messing with each other when FDR and Tuck are competing, and then bickering with each other when they are a team again.
FDR being shot in the neck with a tranquilizer gun by Tuck whilst on a date with Lauren. The look on FDR's face as he collapses onto the sofa, Lauren walking back into the room to find him seemingly asleep - with "Smooth Operator" playing in the background - all make this scene priceless to watch.