Weird guy

So today i had n hr to kill b4 i had 2 go 2 tutoring so i jus sat down at a table (they have little chill spots wit tables all over campus) like right across from the bathroom n stairs theres also an office right next to it. Basically ppl r always comin n goin all the time. This dude comes n sits like right across from me im like watever its a public place but this dude like stares at me for like 30 minutes. I have on headphones n im reading a book the hair on the back of my neck is like on end. I really thought he was gonna try 2 attack me on the elevator while i was leaving...The creepiest thing ever!!