Well this is late, but this tip is a charm for me.
If its a haunted house where people try and grab you *even if theyre not allowed to grab you, they still show up in random places*
Talk to them.
"OH MY GOD *points at growling mummy* I absolutely LOVED you in scooby doo, you were AMAZING, kudos dude...kudos"
Seriously, i got like..5 of these people to laugh, and sometimes i would be like 'HEY..WAY TO BLOW YOUR COVER MAN" xD
So just talk to things, it really takes away the creepy factor of it.