From CTYIwiki

Moved from page to here, does not qualify as a tradition is it is not preformed with enough regularity:

The Tree

All CTYIzens must lick the tree!!!

Elbow Licking

During the last week of Session 1, 2011, someone announced that if one were to lick someone's elbow, said person wouldn't notice. This spawned a great deal of licking elbows around the quad. It worked best when students got cocky and crossed their arms as if to say "You can't get me", to be seen only moments later with confused faces and dampened elbows. The action became particularly popular at the last disco, at which unsuspecting couples would stop meeting and realise they had been licked, and then shrug and start meeting again. It was kinda gross, specially when you think multiple people could have licked your elbows.