I just had a game with an insanely derp caitlyn. I was soraka, meaning we are pretty safe and she just needs to max damage output.
We keep getting ganked by Shaco, and I tank him across the entire river every time, and caitlyn never accomplishes anything because she goes dorans -> zerk -> 3 wards. She has about as little damage output as a real caitlyn build can possibly have, especially since attack speed doesn't boost her abilities, and she has
infinite freakin' mana because she's with soraka. I didn't want to leave because it'd be a bigger disaster without a support babysitting her.
In the lane, I went 1/3/0 and caitlyn went 0/1/0. My kill wasn't even a steal; it was from having to chase someone because Caitlyn set up her ulti for the kill and then cancelled it for no reason and stood there doing nothing because she had no loving idea how to play and apparently didn't know you could cancel your ulti. I chased down and killed her with Starcall + Infuse because I had faster boots.
And after 1/3/0 with derp Cait, how did the rest of the game go? I grabbed a Mejai's because I know I'm legit and went 1/0/17 from there.

That cait tried to lose us the game and failed miserably.