[Barney sings sexual versions of Christmas songs whenever Ted receives a Christmas greeting card from his sister]
Barney: [on first card, Christmas 2005, to the tune of 'Jingle Bells'] Pulling down her pants, yanking off my own, underneath the mistletoe I'll make your sister moan - OOOH! Heather's hot, Heather's hot, and we'll go all the way...
[on second card, Christmas 2006, to the tune of 'We Wish You a Merry Christmas'] I wish I could see her naked. I wish I could see her naked. I wish I could see her naked...and down on all fours! [gets ribbed by Ted]
[on third card, Christmas 2007, to the tune of 'The Dreidel Song'] Ted has a little sister, gets hotter every day, and if I ever meet her with her boobies I will play - Everybody! Sister, sister, sister...

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