Pranks happen, especially during the stress of finals week. But here's a lesson on why you should A.) Password protect your computer or B.) not leave it unattended. Especially in a crowded college library. Says Redditor mcshea89: "she went for coffee. friend knew her password. loaded p*rn. shut laptop. waited gleefully." Her reaction to her laptop's random and humiliating Brazzers outburst is priceless. 

H/T: Gizmodo