The art of finding the remains of a period in public toilets. This leads to the failure to urinate in the same toilet and sometimes vomiting.
If you decide to go to the toilet in college after a female classmate and she has left the remains of a period in the toilet. You then return to your class looking sheepish and frightened. The symptons of this are clear and include:
nervous twitch where they have failed to urinate
This is known as an alex-smith.