A little late on this one but here are a few 'carols' I found funny. Not all of these are 安全, 安全です for work. If あなた have any もっと見る feel free to drop them in the コメント section.
Bob Rivers' 12 Pains Of Christmas
Jeff Foxworthy's 12 Days Of Redneck Christmas
Key Of Awesome's 12 Days Of Miley
Key Of Awesome's クリスマス Parody Spectacular
Jon LaJolie's Best クリスマス Song
Jojo OrangaTang's クリスマス On The Floor
Nigahiga's クリスマス Swag
WaneFawsome's Itchy Balls
Jillian Hall's Rocking Around The クリスマス Tree
Bob Rivers' Who Put The D*** On The Snow Man
Cheech & Chong's Police Got My Car
Bing Bing Bong A Donald Trump Jingle Bells
Bob Rivers' 12 Pains Of Christmas
Jeff Foxworthy's 12 Days Of Redneck Christmas
Key Of Awesome's 12 Days Of Miley
Key Of Awesome's クリスマス Parody Spectacular
Jon LaJolie's Best クリスマス Song
Jojo OrangaTang's クリスマス On The Floor
Nigahiga's クリスマス Swag
WaneFawsome's Itchy Balls
Jillian Hall's Rocking Around The クリスマス Tree
Bob Rivers' Who Put The D*** On The Snow Man
Cheech & Chong's Police Got My Car
Bing Bing Bong A Donald Trump Jingle Bells