I feel the need to share

Everybody hates the guy who just writes about things he reads while studying (wink), so I'm trying not to be that guy. But this one is too good to pass up. I found it on wikipedia while researching the "chandelier sign."

John Thomas sign
The John Thomas sign, also known as the Throckmorton sign, is the position of a penis as it relates to pathology on an x-ray of a pelvis. When the penis (visible on the x-ray as a shadow) points towards the same side as a unilateral medical condition (such as a broken bone), this is considered a "positive John Thomas sign", and if the shadow points to the other side, it is a negative John Thomas sign. This sign is of no medical significance and is employed as a humorous aside.

This is an example of the mature ego defense known as "Humor."