The Grinch's small bladder grew 3 sizes that day.
Not only do I not get this joke, but it was done a year ago by a different comic: http://www.gocomics.com/theflyingmccoys/2011/12/16/
Not only do I not get this joke, but it was done a year ago by a different comic: http://www.gocomics.com/theflyingmccoys/2011/12/16/