To get a new discussion started here, what's everyones favorite scene between Griss and Cath?

Mine is probably in Season 4, when Grissom sees that Catherine is getting ready for a date, and when he says, "Going out?" you can just hear the curiosity/jealousy in his voice. It also kind of suggested that they weren't as close as before cause she lost some of his trust for accepting Sam's check, and even though it was a sad scene, I love angsty moments.