I could cheesedick an undergrad presentation and lose a few points, at most.
But at a con, the one time I didn't know my shit and tried to be a weasel about it would be the time a SME was sitting in the back row, trying not to chuckle at my every fuckup.
If there's anything that led me to chase down every fact like a hunting terrier and only stand my ground when I'm dead sure about it in five different ways, it's that.
Because if you've never watched a speaker claim XYZ was impossible, only for the guy next to you in the audience to open a laptop and show video of when XYZ was done last summer... it rearranges your thought processes pretty hardcore.