Ugh! I hate this too! It's one thing if it is a close friend or family member--when I was married to my ex, I couldn't go past the driveway without bumping into some kind of relative, we live in a small town and his family is HUGE (they have a street and the library named after them--been here forever and a day). But we've been divorced for over 6 years, and although I'm on friendly terms with everyone (including he and his new wife), we aren't on 'drop by' terms any longer.
But the weirdest thing is this year, I've had 3 totally bizarre drop-by's! The first was a former friend who was such a horse's behind, I choose to quietly discourage the friendship--I just couldn't tolerate being around him anymore. Well, I'm home sick from work one day, the doorbell rings....and it is him! After almost 3 years of not seeing one another! Egads!
The next one was a Sunday morning, I'm in my jammies eating brunch, enjoying my peace and quiet (kids were at Dad's for the weekend) and ding-dong--it's a psycho ex-boyfriend I haven't even spoken with since we broke up 4 years ago!! That one kinda spooked me, I checked all the locks and such for days after that....
Then a week after that, 2 brethren from my former church stopped by for fellowship....mind you, I left that church almost 7 years ago.....and one of them was actually part of an elderly couple whose company I really enjoyed....but it being a VERY hot and VERY muggy evening, I'd been sitting in my Living Room in a tank top and underpants. Yi! Not exactly prepared for company....