OMG - wasn't the guy/trick, but the reaction from small-minded people!
OMG, it's a guy sawed in half - the reactions from the small minded people was amazing.
I might be very surprised, but I'd smile briefly at him, and if he was nice, I might ask him "pardon me, but what happened?" but I might take about 10-15 seconds before that just to make sure this was not something not right in the universe, better to be compatible to something not being right in the universe.