Well, if I had been stuck in a jar someone had been drinking out of, I bet I too would feel sorry for myself, and be glad to be out of there. It occurred to me that the rat and cat can also be thought to be part of you: do you have a reason to feel stuck in an unpleasant situation, which you are eager to get out of? Oh, and yes, dreams are indeed funny. And I feel that some have more meaning behind them, but others are just bizarre mental associations that start out with something that may be inoccuous, and before you know it the dreaming mind has exaggerated it and blown it out of proportion, and transformed it following a weird (il)logic, and at the end we get a result that is funny indeed.