We magicians will usually complain about the spectator who's too smart for his own good; but how about the occasional (but rare) ones who are somewhat the opposite?
I don't know if it's just me, but occasionally there will be the spectator who has a very short attention span, or just doesn't pay much attention, then just has a confused look on his face when the magical part of the trick happens.
"Wait, I missed it what happened?"
Ha, it's somewhat awkward and ruins the mood when I have to say "Oh, I just read your mind" or "Your dollar bill just changed to a 5..." And it's not that I'm presenting in a hard-to-follow way, 'cause I usually make it pretty simple. So I was just wondering if any of you fellow magicians ever come across these people, and how you respond to them.

If people aren't able to understand the effect, it's not their fault, it's yours. You're either boring them, going too fast, or doing something that just has too much going on with nothing to connect too. Many times, the three run together. You should never have to explain what the effect was at the end of the effect. To solve these issues, work on making the connection with the audience, SLOW DOWN, and simplify the effects.

I appreciate the advice, but I think you misunderstood me.
I do tricks that everyone understands, I have been performing close up magic for years and I know how to interact with the spectator. I am saying, that rarely there will be someone who just doesn't get what happened.

the most healthy approach is always assuming it is your own fault, because that helps you improve, and it is, always.

I completely agree

My tips still remain. If someone doesn't get what happened, you need to slow down, which is a problem that more than 99% of magicians has, make sure the trick you're doing isn't confusing, which is more often the case than you'd think, and make sure that they care enough to pay attention.

Alright, thanks you all.

look at them funney than say im a magican what do you think i did (insert other skill heare) i did magic dugh

Timing is a massive factor as well. 'cause if you're doing something and they're still laughing at a previous line, or something, they might be missing what you're doing, but that depends on the spectator. I love it how Greg Wilson talks about off-beat and on-beat moments in his routine. Learn heaps just by watching him on his On The Spot DVD