I still cant find anything about murders at the circus but I'd rip off ATTWN by sending people invitations to a free circus and then when only 20 or so EVIL people show...and start finding each other in a lions mouth or hanging dead from a trapeze, they might get a little scared. but that doesn't matter because they will quickly find out there is no way to escape the tent of doom.
Then when the last person is left, the psycho killer will confront the last person and show them the way out, then tell him to walk out very slowly and if he runs he will die (once again a rip from that Greek myth where the dude looks back and like looses his woman) then when he is two feet from freedom he will run out...but nothing will happen, he will just shrug his shoulders and walk on... but what he doesn't know, is that as soon as he walks out of the tent all he will see is desert. No civilization. therefore dieing alone. THE END
Although I can tell you right now that fifty years later some idiot will make a movie where the last guy tricks the killer into killing himself, then he will go hug a lion and they will get married after the drunk in the boat comes to pick them up....(ATTWN)