Actually, something that steams me is when a speaker attends another session and excessively heckles and nearly sabotages the presentation. There are a few who do it and it is really bad. For all the talk in the industry (e.g. "dongle-gate" from last year) about bad male behavior at conferences (and yes, it is bad), what always flies under the radar is bad speaker behavior. Someone tried to do it to me once (I basically shouted over the person) but I know others who have fallen victim to it.

I have never had that happen to me. Actually, quite the opposite. The first time I spoke in Frankfurt back in 2001, my session ended 1/2 hour early because I had not counted on the fact that the Germans, in general, do not do a lot of interacting with the speakers (at least, not until they get to know you better <s>). Lucky for me, Ted Roche and Paul Maskens were sitting in the session and they could see that I had run out of material. They were very supportive and started asking questions so that the session wound up lasting the full 75 minutes. I don't know what I would have done if they had not been there to bail me out.