And picking a random coin that was released today - elacoin.

I happened to be watching the logs and I saw the block chain from 4443 through to 4515 (from 09:00:44 through to 09:02:37) switch to a longer chain. That's almost twice your confirmation period (4 blocks), and that was on a lightly loaded network.

And then, between blocks 5027 and 5100, two miners were fighting over the chain. It kept switching backwards and forwards.