Marshall Eriksen: [Shows the slap countdown on the computer to Barney] Oh my, look at that! That means we're in the final hour of the countdown.
Barney Stinson: I'm not scared...
[his right cheek twitches]
Marshall Eriksen: Then why is your right cheek twitching?
Barney Stinson: It's not...
Marshall Eriksen: Maybe it's because future me slaps future you so hard, it reverberates back to the present, shattering the time-slap continuum.
Barney Stinson: [nervously] Please don't slap me...
Marshall Eriksen: I'm sorry, what?
Barney Stinson: Oh, god, don't slap me again! I don't want to get slapped again! The first two times hurt so bad. I don't like it! I don't like it one bit!
Marshall Eriksen: I thought I ruined it by putting a clock on it, Barney.
Barney Stinson: Well, you didn't ruin it!.You made it so much worse! I can't eat. I can't sleep. I've lost 10 pounds. My suits are wearing me. You know what? I'm outta here.
Marshall Eriksen: Well, no, no, no. You can't leave.
Barney Stinson: Why can't I? Nowhere in the rules does it say that I have to sit through this sort of mental torture! You are allowed to slap my face my good man, but you are not allowed to slap my mind! Good day!
Marshall Eriksen: But it's Slapsgiving.
Lily Aldrin: No! It's Thanksgiving! Our first one as a married couple, as grownups, and you're not trying to be a part of it! None of you are! So, as slap bet commissioner, I'm issuing a ruling. Thanksgiving is a day of peace, there will be no slaps today!