And so I'm not just critiquing the telling of other jokes, here's one of my favorites:
e^x was a gangsta, and with his lieutenants cosx and sinx, he controlled all the town's crime. Until one fateful day, some young upstart called the differential started muscling in on his territory. Protection rackets were the start. Variables and constants alike started fleeing town, afraid of what the differential would do to them. e^x laughed this off. Even after his lieutenants one having been switched, and the other being made negative by the differential's actions, ran off, e^x said, "You lot are bloody cowards. It's time I shut this upstart differential down once and for all."
So e^x challenged the differential to a showdown. They met in the high street, and e^x said to the differential, "Now see here you little pipsqueak, I'm e^x. You can't hurt me, I'll stay the same no matter what you throw at me, so why don't you piss off back to sideways-ville."
The differential laughed and said,"Do you know what they call me back in sideways-ville?"
e^x barked a laugh saying, "Why should I care?"
"Because," said the differential, "My whole town is perpendicular to you lot. I'm d/dy, and you're MINE, b***h!"
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Ok. so I drew it out a bit too long, but I hope it's still funny. lol