Random OP in a server

So yesterday I joined a random server and somehow I had all op powers! I banned everyone and then griefed it. LOL. Sadly there are no pictures

I invited @Serilex and he replaced like 10 chunks of the world with TNT and then triggered it. The server crahed instantly.

Any idea on how this happened?

Maybe the VPS doesn't fit to handle those thing you do on that 'random server', btw, good job till' you get opped xD

It was so funny when I kicked the server owner. I hope this happens more often xD