Happened to me a number of times. Walking round Tesco in Blandford Forum with the then Mrs MIW and saw a prossie shopping with her husband. She literally followed me round the store until I made an excuse to leave said Mrs to go to another aisle where this prossie followed and she mouthed and gestured for me to call her soon. I did, of course, to ask her what the fuck she thought she was playing at.
Another time, with same Mrs MIW, we were at a family house party in the outskirts of Bournemouth when I was confronted with a lady called Inga, a very popular prossie (and one I had seen about six or seven times). A bit awkward to say the least but it turns out that this girl was known to my father in law as the lady who he went to for "physiotherapy". After finding out this information it suddenly didn't seem so awkward - for me, but my father in law looked a bit sheepish. Funnily enough we never mentioned the coincidence and his daughter and I separated soon after.
Fast forward to June last year and took the latest Mrs MIW for a birthday curry in Norwich and was shown to a table for two. Lovely old job. Until two young ladies were seated at the table next to us. I couldn't believe my eyes when I realised it was the lovely Gemma and her duo partner Missy Munroe. That made for an interesting meal!
And finally, again with the current Mrs MIW, was sat waiting in the pharmacy attached to the doctor's surgery and I realised we were sitting next to Emily of Norwich, who I had fucked about a month before. She smiled at us and my Mrs engaged her in small talk for what seemed like fucking ages until her prescription was ready. We said our cheerios and left. "She seemed a nice lady" observed the current Mrs MIW. "Yes, I'm sure she is" says I making hastily for the motor.