We all know that call invokes a function and ret returns to the caller. Alas, nothing is certain in the binary world. The ret instruction is quite often used for short jumps within a function. Among many other improvements in IDA v5.1 there will be a special logic to recognize and mark such pseudo-returns. I was surprised to see this graph and post it here for your amusement:


http://hexblog.com/2007/02/does_return_come_back.html