Spotted George Lucas!

I was picking my mom up at the airport yesterday and as I walked through the parking lot, I spotted a man that looked like George Lucas. I didn't think much of it because he seemed pretty "normal" (he didn't have a body guard or anything like that and he he was dressed in a plaid shirt and pants). Then, as I approached my mom standing on the sidewalk, she asked me if I knew who that man was. I didn't know for sure, so I just said, "No, who is he?" She said, "That's George Lucas." 

I had to do a double take and scrambled to get a better look at him again. I did not have a real camera with me, so I just pulled out my cell phone and tried to take a picture without looking too obvious. I couldn't get close enough to take a good picture, unfortunately, but at least I got to see George Lucas and his girlfriend get into their black Lexus and drive away. I didn't have the nerve to go up to him and ask him for an autograph! He didn't seem like he wanted anyone coming up to him, and neither did she, for that matter. She had something of a glaring look on her face (she didn't seem to be in a good mood as she strutted through the airport with her fancy, red leather purse) and I had a feeling she was irritated because she thought I was going to take a picture of them or something.  Neither one of them smiled, anyway. I realize they might be sick of people taking their picture, but what they don't realize is that this was a once in a lifetime opportunity for me to get a picture of them and see them in real life! But to them, I was probably just another annoying fan attempting to get a picture of them. They might have been hoping no one recognized them enough to ask for an autograph. I lost my one and only chance to ask George Lucas for an autograph because I was trying to be polite and just leave him alone, since he probably prefers to be left in peace.  While I was standing next to their Lexus, I had to pretend I was talking on my cell phone so they wouldn't think I was trying to hold up my phone to get a photo of them! I was just surprised he didn't have a driver or an assistant with him! Wouldn't it just be easier for him to hire a driver and not have to deal with bay area traffic himself? 

What would you have done in this situation?  Should I have just gone up to him and asked him for an autograph?