I have a quick question.
I'll be sitting in class using my computer and a message box will pop up in the middle of my screen with a short humorous message :] (usually the whole class receives the message) I'm sure it is a student (as a someone who is employed by the college would be reprimanded for these sometimes crude messages because it is kind of an anal retentive college)
I'm wondering how someone would be able to do this.

Thank you