Ted: So why is it only half a butterfly?
Lily: Because Gary Blauman saw me in the tattoo parlor, dragged me out and talked some sense into me.
[flashback to Lily and Gary Blauman at MacLaren's:]
Gary Blauman: Lily, trust me, you and Marshall are going to get back together. And when you do, you'll be so glad you did not get the other half of that butterfly.
Lily: Actually, I was gonna get a little more than the butterfly.
Gary Blauman: It's good that I ran into you.
[present:]
Lily: Marshall, Blauman saved you from a lifetime of looking at Sugar Ray every time we do it on your birthday. Find him a nice seat.