Future Ted: [v.o.] Kids, you remember Barney and Marshall's "slap bet". When Barney lost, Marshall won the right to slap Barney five times as hard as he could. So far, he'd used three slaps of those five slaps. With the third being doled out exactly two years earlier on Thanksgiving day 2007. A day that history came to know as "Slapsgiving".
Ted: Are you saying...
Robin: What we think you're saying?
Marshall: Probably not. Unless you think I'm saying "Slapsgiving Two: Revenge of the Slap", in which case, yes, that's exactly what I'm saying!