Wait til you get a load of Alyson Hannigan like you've never seen her before when she dresses as a stripper version of Lily. No, it's not Lily herself, just a look-a-like.
Marshall and Lily give each other one horrified look in the season five episode, "Double Date." I guess you would too if you saw a version of yourself at a strip club.
Barney: Guess who got four tickets to the the origins of chewbaca exhibit? Lily: Why? Barney: No, I said who Lily: I heard you Robin: Isn't it a little early in our relationship to be doing things that would end our relationship?