I cant do it on demand - but I have had it happen a few times
The one issue is when no one can see you - if others show up and they are cool, legit players just there to do some leveling up themselves - they can't see you either LOL So if you are trying to go solo and they start hitting your targets - its legit cause you are 'invisible to them'.
Its fun for a few minutes (we had some fun one night for a while 'spooking' other Guild Mates LOL), then I usually get out