For a magician, hecklers could be the worst kind of people you'd ever meet.
However, I am inclined to think otherwise.
I truly believe that the worst spectators around are the ones who practically destroy your props, whether by sheer carelessness or outright malicious intent to ruin you.
Last Saturday, I was treated to the rare privilege of performing, upon request by another magician, for a group of people containing two of the worst possible types of audience ever: the said heckler who had something to say every five seconds, and the blithering nincompoop who heavily damaged my Wizard Manual finale.
I cannot conceal how annoyed I am at the one who asked me to perform for his friends, because he knew in the first place that I was going to deal with a mouthy know-it-all in the audience, when I wasn't even going to do "magic", to begin with. I was going to simply do mentalism, and the bloody fool, in her desire to be the star of the show, was too stupid to remember the two words I asked her to remember on the page. My only vindication was when one of the other people asked me if I could turn her into a monkey, and I snappily retorted, "It's been done already."
Nomer, friend or no friend, I'm never going to do magic upon your request ever again. That was a horrible experience that just pissed the Hades out of me. The Wizard Manual does not grow on trees, so I'm being exceedingly nice in not asking for a replacement.