It is a common
practice among college, university and high-school students. This practice is ususally exercised by students who are obsessed with comparing their academic achievements with classmates.
Some find it to be highly invasive. This offense is serious; it is an invasion of privacy and can be categorized as a violation of personal property-rights.
Kent: I aced it. I got 96%.
Clark: That's sick dude! I wonder how I scored.
(out of nowhere, Tiffanie appears)
Tiffanie: You got a 14.
Tiffanie: 14 percent.
Kent: How'd she know that?
Clark: Clearly she's a Pigeon-stalker.