Quote from Barney in The Three Days Rule
Ted: I just got that girl's number. Check it out. Holli. Barney: Nice. Girls whose names end in L-Y are always dirty. Holli, Kelly, Carly, Lily. Marshall: Hey! Oh, yeah, I know it's true. Barney: And don't even get me started on girls whose names should end in Y, but instead end in I. Those girls are like roller coasters. You got to wait in a long line, but once you get up there, you just hold on for dear life and hope you don't drop your keys.