"Yes sir, it's a nice new AR, but you can't shoot it without sights. Because(you moron) you can't aim it without sights."
"Sir, a front sight only doesn't cut it, you need a rear sight as well. SO YOU CAN ACTUALLY AIM IT, that's why."
I've witnessed three of these conversations, and know of a couple of others. For some reason a few idiots think "I just want to try it out, I'll worry about some kind of sight later" and think that's a good idea. Which leads to us pointing out that we don't care if it's a $15 set of irons off Ebay or a $100 red dot or a $1500 Trijicon, there has to be some way of actually aiming the damn thing before you can shoot it here.
It's enough to ruin your holiday mood.