I'll teach YOU for arguing the point!

Interesting read ... MATE!

Caution   Enabling this feature on a port connected to a switch or hub could prevent STP from detecting and disabling loops in your network, and this could cause broadcast storms and address-learning problems.

I suppose normal people when they don't know what they're talking about would go look up what they've been told to look up.  And they wouldn't argue about anything they didn't know anything about.  That would be a normal person wouldn't it :)  Not our friend DND, no.  No, DND decided that what he did yesterday wasn't really a problem.  No issues at all.  Sure it didn't melt down the network this time, but let's be honest.  Luck won't save you every time.  At some stage, your sorry ass is going to be found out if you're lying about what you know.