You carry on into negatives. Eventually you'll get to -32,768, and then you can start again from 32,767 - assuming you have a 16 bit brain that is. God help you

You carry on into negatives. Eventually you'll get to -32,768, and then you can start again from 32,767 - assuming you have a 16 bit brain that is. God help you if yours is 32 bit.