How I Met Your Mother - Marshall's Slapsgiving

[postlink]https://howimetyourmother-photos-videos.blogspot.com/2009/11/how-i-met-your-mother-marshalls.html[/postlink]http://www.youtube.com/watch?v=E_xWS0JfMikendofvid
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Marshall reminds Barney that he still owes Barney a slap
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