In school, the only computers people seem to carry around are Macs. And almost everyone uses a computer when sitting in lectures and tutorials, so get your head around that.
One time, a lecturer even amusingly commented on how dominating apple computers were, to the point that despite being a room with hundreds of students, he could pick out that "One small Dell user over there". Since you know, he's the only one using a non-Mac computer.
I pledge that I am also guilty of contributing to Apple's sales, and for the sea of Apple laptops that lectures see when they face all the students.