The Christmas Eve Hill ride is so tough that...

 - you get coal even if you are nice
 - even when you ride down it you are going up hill
 - throwing up is not optional
 - when someone does make it to the top, a pig will fly over head and there is a snowball fight in Hell
 - you can measure your speed with negative numbers
 - if your chain didn't snap then it will soon, when you are in the midde of a busy intersection (the Hill's revenge)
 - it takes a year to forget how hard it was and think about trying again
 - Chuck Norris can't make it to the top