Two And A Half Men: Season 7, Episode 10

7 - 10: That's Why They Call It Ball Room

Charlie and Chelsea get into an argument about dancing at the wedding, and the two end up going to dance lessons together, where Charlie finds out Chelsea has been keeping secrets about her finances: she owns multiple properties that she had never mentioned before; making her richer than Charlie, which angers Charlie as she hasn't paid any bill in the house while they have been living together. Alan and Jake watch Alan's old wedding video. Title quotation from: Charlie, to Alan, while dancing - after Alan explains there should be no groin contact.