that's the general rule, but i'm going to play along this time, because -1 does seem a bit harsh for what you wrote.
humor is risky. it's not that news.yc readers don't like it, it's just that our standards are very high. the ^H^H joke is a threadbare cliche at this point and should be avoided.
sometimes you get downmodded for no real reason by a karma troll. if that happens, you really shouldn't complain about it, because within an hour or two somebody will vote you back up in sympathy.
The whole deal is that it cant be reduced to a formula - unless you have a lisp script for it, in which case Id accept that as proof I am wrong.