I'm with you on this one. I also switch to find an empty world, I do think that it is pretty rude to plonk down a cannon in a really populated spot... Make mine a third vote for "you can, but that's really rude and lazy of you to not hop a little to find a less than populated world." I'd bet dollars to donuts that you like doing it in a popular world, annoying people, thinking you can "show off" to those that don't have one. Does doing that make you a 'noob'? Well, I don't use that word. But it does make you the kind of rude, anti-social person I'd never want to be around. Firstly, you CAN'T use a cannon with an empty world at rock crabs-they aren't disburbed so they can't use cannon to attack. As for people who say cannon is nooby? Well, you payed 550k + cannonball costs, which ain't cheap. Remember, at the end of the day, you bought it with your money.