Diablo 2, on dialup. write down my ip, log off and call kenny. log back in. spent about 20 minutes until we figured out what the hell was going on. XD eventually used a neighbor's phone to communicate until game connection.
before that, Diablo, entering a pvp game and not hacking my character stats.
Rainbow Six 3 xbox, team survival, team kill enabled, pulled a grenade at the spawn.
The Sims, didn't make 'hamster' families in the neighborhood. Those poor unsocial pixel people, they ended up hating the stock families. there were 3 stock families, right?
WoW wrath era, put talent points all over the board instead of investing in one tree. got to 50 before i realized what i was doing.
that's all i can think of right now... pretty sure there's been more
EDIT: one more right away, Tekken, that brazillian capoiera guy, i thought he was 'technical' for like 3 weeks. was so disappointed when i finally realized he was a button mash type. maybe the denial was too thick.