Strange Observations: Hott Guy...lol.

Okay, so I'm sure you have either seen or heard of a moment similar or exactly like the one I'm about to describe to you. Don't worry, it isn't that big of a deal. It's not life changing, or noteworthy, but it generally interested me.
I was sitting at a pool party at one of my friends houses, and i was talking to three of my friends. I'll call them Leif, Cher and Rae. I was talking to Rae when Leif came up. I introduced him to Cher and we were having an interesting conversation. All of a sudden I get a tap on my shoulder by this girl i know who kinda LOVES Leif, but will probably never tell him. (I don't know why, but for some reason every girl who likes Leif loves to tell me all about him. How cute, hott, handsome, gorgeous, nice, kind, sweet, gentlemanly, funny...etc...fill-in-the-blank he is. Which is fine he definitely is all those wonderful things. In all honesty he's probably one of the most attractive people I have ever met, but I like just being his friend. AND i kinda get annoyed when you can't even mention his name with some random girl spilling her guts about how incredibly dreamy he is. It's probably very similar to being friends with Brad Pitt.) Anyway, in the process of turning and saying, "hi" to her Leif apparently takes off his shirt to reveal his "amazing six-pack". I don't see a reaction from either her nor Rae who by the way likes him to, but she's not weird about it. When I turn back to say something to Leif, he is now in the pool. As soon as, he hits the water this girl who will be called Lea, somehow manages to swing to the other side of the table and sit down before I even know what's going on.
Lea continues to go on about how incredibly hott he is, and it was kinda getting on my nerves. She went on about, "How can someone be so hott?! He's ripped! When Leif was taking off his shirt I tried my best not to stare at him..." or something to that effect. I laughed because the last time we had been to this pool party, Rae had a hard time keeping her eyes off of Leif.
I find this particularly amusing, because I have never had to worry about not being able to take my eyes off of a guy. I've never seen it in action, and it kinda baffles me. But my biggest question is whether or not Leif knows the power he has over these girls, and/or if he realizes it doesn't even phase me. Pretty much every girl couldn't keep her eyes off him the whole night. Some were better at hiding it than others, and the whole scene was quite interesting to observe. But my question to you is....

Has this ever happened to you, or to someone you know? if so don't be afraid to comment. =]