Bumping Into a Couple On a Date

My first reaction was "how odd."
I was on vacation, in a city with a miniscule Frum population. I mean, it's ironic that a gal from a place with a really large frum population, such as the one where I live, has to go on vacation a couple of hundred miles away to meet a couple on a date.
The scene was comical. The girl took one look at me and turned a brilliant shade of green. The boy even had the good grace to blush. Me? I was trying not to laugh. This wasn't a one-second encounter. This was a I'm-sorry-I-didn't-plan-things-this-way. The poor kids, they sat there in silence, perhaps conversing telapathically. I can just hear the conversation: "we should probably wait till she's not in earshot before we resume talking." "Yeah I was thinking the same thing!" "cool! Is this what they call chemistry?"
Personally I was sending them telapathic messages too, "don't worry. I don't know you. Really, I don't know anyone who lives her, you are safe. It's ok."
I don't think they got the message. They just sat there in their awkward silence, willing me to disappear. I didn't, but I do like to imagine that they went on to get engaged, and married, and eventually have 15 kids. I like to imagine the kids sitting around the shabbos table, and little Yanky saying "tatty, can you tell us the story of how you were on a first date with mommy and this weird girl was there and you were so embarrassed?" Then little Rivkala chimes in "yes, tatty, can you PLEASE say it!" Not to be outdone, Sarah Leah says "Tatty, PLEASE? it's my favorite story!" So Tatty sighs, and starts the story... "Well, kinderlach, you see, before mommy was married, she lived in [insert name of mildly popular vacation area] and I went up there to go on a date with her. I picked her up, but things weren't going too well. We didn't have too much to talk about. But then we went down to the water and there was this strange girl there. I'm not sure exactly what made her strange, but she was laughing too much. Anyway, mommy and me didn't talk while she was around, which was a while. But as soon as she left we burst out laughing, and that was the beginning of things. Now we're married with 15 kids, so I guess it all worked out."
"But tatty, what ever happened to the girl?" questions little Hindy. "I don't know zeeskeit, but I'm pretty sure she forgot all about it."

Either way, that's not the only time I bumped into dating couples. Once, I was stuck in traffic, we're talking non-moving FDR kind of misery, and I found it pretty amusing that a majority of the time I was parallel to a couple that was no doubt on a date. They didn't look to thrilled about me staring into their car for an hour, or maybe they simply weren't thrilled with each other. I was thinking that he looked like a very eligible young man (or perhaps he was simply driving a very eligible new car) and maybe it would be a good idea for me to roll down my window and let him know I'm available. I took pity on the poor girl though, and remained content sitting looking into their car and analyzing the situation.

On another occasion, my sisters and I went out to eat. Just as we walked into the restaurant, my sister's face lit up in a special way. "Splendid. That's my friend, and she is obviously on a date." the guy got up, and the girl beckoned my sister to come to her table. "This guy is SO not for me, I can't wait till this date is over." Personally, I found it funny. Why did the guy waste his money taking her to such a fancy restaurant so early on, before he knows if she's worth all that money? I wonder if it wasn't as bad as the girl made it seem. Perhaps she was just embarrassed at the situation, and figured that statement was the surest way to make sure that we wouldn't publicize our little meeting.

My sister had a great story along these lines. She was on a date, and they met another dating couple in the park they were walking in. The couple looked extra radiant, and they confided in my sister and her Prince Not-So-Charming. "We just got engaged!! The two of you are the first to know about it!!!" My sister and her date congratulated them, and then it got awkward. The girl looked at my sister with searching eyes. They were asking "and you two?" My sister tried to signal back with her eyes, to let her know that Miss Kallah might be in the company of Mr. Right, but MG's date was sadly Mr. Wrong.

What do you do when you meet a couple on a date? Ignore them? Pretend you don't realize it's a date? (i.e. ask how they know each other)
Have you had any great stories when this happened?