What subject do you feel exceedingly comfortable talking about? So comfortable / interested, in fact, that you could do a 2 hour lecture in front of 150 people without fear.
I curious.
My hair. 
Your hair? Can you really imagine doing a 2-hr lecture on that?
…
Can I I touch it?
I could do an easy two hours on how I can never find any nice clothes…
Yes, but not the bangs because they’re already messed up. They just won’t lay right today, I’m thinking it’s almost time to cut them again. I got out the flatiron this morning and did the rest of it, but the bangs looked okay then so I left them alone and now they don’t want to match up with the rest of it. I’m trying to grow out that layer that blah blah blah etc. etc.
Classical homeschooling, apparently, because that’s exactly what I’m going to do next month at the state homeschooling convention.
I’m nervous, but confident that I can do a good job.
I’m doing a 2-hour lecture on health reform in October and one on Medicare in November.
Other than that, I could talk for hours about my kids, but I’d prefer my audience not be bleeding from the ears midway.
Music theory, saxophone technique, sightreading, music memorization, section leading, band leadership in general, how to be a cool band parent without letting teenagers walk all over you. I could easily fill up 2 hours.
Or, how to be a valuable raider in WoW.
You eclectic son-of-a-bitch!
I can’t do public speaking, but if I could, my topics would be medical marijuana, dermatology/skin cancer, babies, and sex. I could go on and on about any of those things.
Anxiety disorder and phobias. Unfortunately the subject is close enough to me that I’d never be able to get in front of that crowd in the first place!
I could talk at length about theater technique and acting. Honestly if you get me started you will have a hard time getting me to shut up to the point that I actively avoid talking with people about actors in casual conversation (or on message boards) because I tend to get a bit intense about the subject. When someone says, “Oh I hated (insert actor’s name here) in (insert film project here). They weren’t realistic at all” They typically just want you to agree with them and not go onto a 20 minute rant about acting styles and how their interpretation of realistic acting isn’t any more realistic than what they consider to be poor acting.
Oh, I would love to have that conversation with you! I often can’t pinpoint what it is I like or dislike about an actor’s performance, especially when I seem to be the only one who liked or disliked a certain performance. I would find it really interesting to learn what techniques he or she pulled off correctly or not.
Curious, though - if I tell you I didn’t buy Bigname Actor’s delivery of character x, and you tell me all the reasons why his technique was perfect, I would find it perfectly fascinating and may even gain a new respect for the actor in question, but it’s still not going to make his performance more real or believable to me… Does that bother you?
I could probably talk your ears off about healthy eating and exercise. That’s because I lost over 60 lbs. doing just that, and I’ve kept the weight off for a number of years now.
However I won’t even start because that is probably the most boring subject in the entire universe. 
I can, will, and have talked at length about these broad topics:
Sex and sexuality*
Gender roles
Bargain hunting
Knitting and fiber crafts
Horses - super obsession
Special:
Math Makes the World Go Round*
Why I love Physics*
Let me Deconstruct that Work of Fiction for You*
*Have presented in a professional setting
No. The difference for me is, frequently realism and believability aren’t the point. Sometimes they are, but often they are not. The biggest problem I have when talking to people about art (any art really, but I am only really qualified to talk about theatre stuff, and movies a little bit) is that many people don’t judge the work on it’s own merit, but rather judge it against some subjective ideal that may or may not have anything to do with the intent of the piece.
For example: Let’s say you go to see a play written by Brecht. We will pick Threepenny Opera as an easy something that you might happen to have a chance to see. Ok, so you are at this production of Threepenny, and the whole time you feel like the actors are mugging and winking at the audience and generally breaking the forth wall or totally overacting. You can’t forget that you are watching a play and just fall into the story. The acting isn’t realistic, it isn’t believable, and if you told me that you thought it was bad and gave those as reasons I would tell you you were wrong. It might be bad, but if realism and believability weren’t the intent, and with Brecht they should never be the intent, then it doesn’t matter. You aren’t judging the work on it’s own merits. In this case the mugging and breaking the fourth wall are part of the performance, and are intentional. They add an intended layer of artificiality to the show that is supposed to be there.
I spent some time on here defending January Jones’s performance in Mad Men, as being totally brilliant, while others said she was wooden and not really acting. My feeling is, even if it is accidental (and you should never assume anything is an accident) her portrayal of Betty is one of quiet rage that boils just below the surface. Occasionally it pops up, but mostly it is ice cold, and that choice is perfect for the character. Yes, she seems flat and wooden most of the time. SHE SHOULD! But there is nuance there. It isn’t like she is Ben Stein, she is acting, and playing quiet is really remarkably hard to do. That’s what acting is all about. Finding the choice that works best, and then executing it perfectly. She is the most underrated talent on the show.
And…well you see what I mean about getting me started. I could go on at length.
I love to teach and standing in an auditorium in front of people just rocks. So, really anything if given a few hours to prepare I could do. But the question is what I want to do.
Your Disney World Vacation - How to save money and time and still have fun!
Oh…I want to hear that one. Do you have a Disneyland one too?
Torquemeter history, design, uses and installation. With calibration and overall accuracy thrown in just to make it fun.
At first I read that as Torquemada…
I could go on about the evils of MSG and other artificial additives, especially for kids.