Lunch time favors

Often on Fridays, a couple of us from office go out to lunch together. Today, the junta was in mood of going to the steak house and so I politely declined.
Now I had the goliath task of deciding where to go out for lunch. Burgers, fries, subway and tacobell were all ruled out as I have had an overdose of them this week. Other places that I could think of couldn't be enjoyed in solitude. So I figured it would be good opportunity to hit one of the buffet joints and stuff myself. And pizza hut lunch buffet it was, even if it meant sweating an extra hour at the gym in the evening.

One of the things that really scares me out at these pizza buffet joint is the obese people that you see around. No offense to them, but some of my friends would joke that these buffet joints are the sole reason for their obesity.
I filled my plate with a few slices of pizza and some salad at the side and took my seat. Now when you are all by yourself, you tend to look around to see what mischeif the people in the adjoining table were upto, you become more nosy, try to strain your ears to overhear some conversation. I had found my victim. They were sitting in the next booth. An old black "Momma" woman complaining (read bitching) about her "honey" "sweet" little daughter to her husband. The accent, the double negation in her sentences and the bitchy deed her daughter was upto formed an amusing conversation to keep myself entertained.
In the mean time, the table, diagonally across which was vacant finally got its occupant. A beautiful looking white caucasian lady with her 10 year old son. Now thats when my fun was interrupted.
Whenever I looked at her table, I found her staring at me. I thought she would have noticed I am becoming too inquistive about the black couples conversation, so I started to mind my own business. Now if you notice that someone is looking at you, you tend to check back after a few minutes to see if that is still continuing. Checked her from the corner of my eye and she was still staring. My hair was combed fine, pants zipped up and I had not spilled pizza sauce on my shirt. And this made me feel uneasy and uncomfortable. I decided to look straight at her and give her a smile, probably to initiate a conversation to see what was wrong. I got no response from her but now I was cent percent sure, that she didn't have a squint in her eyes and she was indeed looking at me. I scratched my head to think if I knew this woman even remotely or if I had ever seen her somewhere. This was the first time I had ever seen her.
Now had it been a blonde girl in her twenties staring at me, I would have felt happy and probably shamelessly gone and spoken to her. But this woman was making me loose my appetite. I wanted it to stop. I decided one last attempt to look straight back at her and make it stop, else I would approach her directly.
I looked up at her. She turned her face, checked to see if her son had eaten fine and walked off to pay the bill.
As she walked out I was sure she would look back and she did. (Now don't think of the DDLJ "Palat" scene...she wasn't the kajol of my dreams)
Good riddance I sighed! I couldn't stop wondering what was up her mind. She had walked in much later than me, had barely eaten and left. There was something amiss somewhere.
I had lost my apetite as well and decided to leave. I went up to the cashier to pay the bill and he said
"You have already been paid for! The lady with the kid that sat across, paid for you!"

I don't think I am ever going to solve this mystery....