Brennan: (about her shoes) How does anybody actually walk in these things?
Booth: Well, ya know, them boots? They ain’t made for walking sweetheart. (Booth slaps Brennan’s butt)
Brennan: Okay, that was completely over the top.
Booth: Alright, you know, you play your part and I’ll play mine.
2x08 'The Woman in the Sand'