1) People will constantly pass out from any mild fever, preferably in front of a love interest that is about to yell at them.
2) Every war will be fought by adults, but won by teenagers, and preferably teenagers that control giant robots.
3) Every 'nice guy' out there will be surrounded by 3-5 women who all have a thing for him, each of whom have a vastly different, yet stereotypical (and ultimately shallow) personality. Most likely one will be a tomboyish childhood friend, one a new beauty in town whom the guy falls for instantly, another will be an atrociously mean spirited person with a sensitive side, with yet another being incredibly ditzy but with Huge Tracks of Land, and at likely one more who's mature and stern. At least one of these girls will look like she's eleven years old, but actually be twenty so that it's totally cool when guys end up in sexually suggestive situations with them.
4) Women will be treated like objects even more than they already are.
5) Most conversations between the opposite sex will end with the woman screaming at the man and then running away, usually in heels, while the man dumbly stands there, despite being able to easily out run her.
6) Every girl living in an all-girls school will be a lesbian. Every single one, without exception.