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Neil Patrick Harris, Erin Cahill, Josh Radnor

Jeff Vespa/Getty Images, Angela Weiss/Getty Images, Jim Spellman/Getty Images

Do not let Barney Stinson (Neil Patrick Harris) near Heather Mosby (Erin Cahill). I repeat, do not let the sex-crazed maniac near Ted's (Josh Radnor) little sister! Otherwise, most of what Barney sings about in the video below would probably come true.

Hold on—sings? Yes, the writers of How I Met Your Mother saw fit to give NPH a platform to sing, and it's awesome. (P.S.: You saw Prop 8: The Musical, right? I know you saw Dr. Horrible, because to do anything else would be a travesty, and speaking of Dr. H, be sure to check back Tuesday for our review of the DVD.)

Get the Ballads of Barney below as Barnana puts his dirty, dirty feelings for Ted's sibling into lyrical form...

"Little Minnesota" airs on Monday, Dec. 15 at 8:30 p.m. on CBS. Happy holidays, tubers!