me and some friends, when we had math class and got to use the computer room at school (early 00s) would usually hack the network and run Warcraft 3 FFA LAN games, but we had to constantly alt+tab out when the teacher came by, which could lead to some serious casualties. xD
Also we had another class where the teacher was into games, and didn't really care much for his job, so he let us play civilization 3, and would give us tips along the way as we battled it out with eachother. Sometimes he didn't give a flying fuck, and the whole class would be playing CS 1.5 deathmatch.
Then I got to high-school, media & communication education, and well.. basically we just sat at computers all day, supposed to edit videos and images in photoshop and such... well... rarely anybody did anything. mostly the whole class was either discussing WoW that just released, looking up exploits for it, or just playing silly flash-games competing against eachother for the highscore.
Was fun! No laptops back then - except you could get some sort of a massive brick of a slowass laptop with limitations on software if you had some learning disability.
My cousin used to be a sercurity guard someplace, and well... you could say he got paid very well for playing WoW 8 hours a day xD