Last night's 2014 'How I Met Your Mother' premiere "Slapsgiving 3: Slappointment in Slapmarra" ran the gamut from elaborate loveletter to the series' best recurring gag, to another uneventful installment of the ninth and final season, but if nothing else, it gave us one unforgettable ending. Ladies and gentlemen, Boys II Men performing "You Just Got Slapped"!

Much like the initial "Slapsgiving" ending that saw Marshall (Jason Segel) performing the song on the apartment's piano after another successful slap, 'HIMYM's latest reprisal of the iconic song unfolded just a bit outside of reality. Following the "Slap of a Thousand Exploding Suns," Marshall introduced the reunited band in the woods outside the Farhampton Inn, delivering their soulful rendition of the tune.

Unless of course, we're led to believe that Marshall actually shelled out for an elaborate middle-of-nowhere performance from the group, but then again 'How I Met Your Mother' has gone far crazier. If nothing else, last night's installment reminded us of better 'HIMYM' days past, before we head into the March series finale, and potential spinoff thereafter.

Check out 'How I Met Your Mother''s slap-tastic Boys II Men appearance in the video above, and tell us in the comments what you thought of "Slapsgiving 3: Slappointment in Slapmarra!"