Quote from Robin in Slapsgiving 2: Revenge of the Slap
[Robin warms up and gets ready to slap Barney. He winces] Barney: It hurts! Robin: No, I can't do it. I can't take this from you, Ted. Ted: No or I, you. Barney: Thank God. Robin: So, I'd like to make a gesture. Mickey? Barney: Oh, no way! Robin: I'm glad you and Lily are trying to work things out. So, to welcome you to our little family... I'd like to offer you this slap.