I'm pretty sure that was a game/gimmick and part of the conference badge challenge. But maybe not. Regardless it is a security conference after all and I'd totally expect people to be playing around like that. I don't think it would have been seen as malicious.
Wait till your brain integration gets malware and your thoughts are locked away...
Never gonna give you up
Never gonna let you down....
It was a joke and part of the actual hacker festival.