   Just saw the funniest thing...
  Hehe...I just saw the funniest thing...I was playing around in my plattformer game with some debug text, the players coordinates are written over his head...and then I fell off a ledge and thought...well let's see how far we can go before the program crashes...so there I sat...and then my player just fell on to the level again.Guess the surprise for me =)But then I tested it again and paid a little more attention...so in this SDL app 1280x1024 I could fall to ~ 30000 on the y axle then it becomes -30000...Anyone a little more experienced that can tell me why this is? Because it isn't ordinary int overflow(or the correct term in english) were the variable "goes around". Is it?   
  If it changes around 32768, then it probably is overflow   ;  The range of a 16-bit signed value is -32768 to 32767.   