[jacquesm]

That's why you have at least one techie in your booth crew. Which has been my role on more than one occasion.

FWIW I worked the booth on a CAD/CAM show in Utrecht one memorable week in the 80's and the number of master mechanics that tried to get the toolbit to run into the chuck was rather larger than expected. Good that I took care of that in the software. But this mentality, of putting stuff through its paces and to show off what you can do with it is exactly why you have trade shows in the first place, to interact with people and to let people interact with your gear to see what they are up to and to strike up conversations. Not all of these pay off.

But sometimes the kid in the greasy jeans and the t-shirt is the guy that will land you the big contract, as opposed to the guy in the suit who passes by your booth just for the swag.

[user_7832]

I'd like to point out that just because it is expected that folks are going to try to come and try out a product (and potentially damage it) does not justify it.

OP entering a funky command is not unexpected. But then purposely antagonizing the sales rep was a d*ck move in my book. If OP had just shown the guy "Hey here's what I did and what it does" that would be perfectly fine (important distinction, OP knew more than the sales guy compared to your case). But if the sales person was legitimately panicking that's not very polite, to put it mildly.