I actually haven't.. I've only gotten 4. This has happened more than once, but my most memorable just happened two days ago. It was in Rusted Lands. I jumped over the crumbling building by Point B and saw - to my surprise - 4 people on the point. I laughed maniacally and Superman'd right into the middle of them as they tried to scatter. It was glorious mainly because I had no idea there were 4 waiting for me. I should have recorded that one as it was rather funny.