I have 2 cats that are both a pain in the arse 
One of them cries constantly for food. The bugger will wake me at 4am by miaowing very loudly at the bedroom door until I get up and feed him. He is treated monthly with advocate so doesn't have worms, he's not over or under weight. If he doesn't have the food he likes he will cry and refuse anything else he is offered. If there is food in the side - regardless if what it is - he will steal it. Honestly, he's driving me potty!
The second one is no trouble, don't know he's here. Unless he's sitting somewhere and you need to move him. He will scratch and bite if you go anywhere near him, even if he's been happily petted in the instant before! If he was a dog I'd be missing a finger by now I swear.
So, any ideas? His can I get the little sods to bloody well behave?!