I have a Parking AND Politeness one...
The other day I was on my driveway having just pulled in and was having little think before going into the house. A lady then pulled in over my driveway, she was waiting to pick up her friend from over the road (they don't have drives)
I opened the car door and the driver waved very apologetically and started scrabbling around for her keys, clearly thinking I was waiting to leave and getting out to ask her to move.
I was too embarrassed to say "It's ok, take your time I was just randomly sitting on my driveway not going anywhere" so I waited, let her search getting increasingly frantic then eventually helped her look for her keys the whole time accepting her apologies. They had slid down under the mat.
She then moved her car and I felt obliged to actually go somewhere. So I pulled away and was going to go down to the roundabout and turn and come back when I realised she was following me with her friend who'd arrived. I then had to appear as though I was actually going to a real place and ended up on the single A road out of town, with them following me, with nowhere except farm track for a few miles to turn around in. I pulled into a garden centre where they of course pulled in. We then had such a laugh about the coincidence of both going to the same place...
I came home with a bag of gravel and a shrub that I only peripherally needed, two hours later than I'd planned.
Now that neighbour over the road knows that I'm "getting into gardening" she is coming over this week with some cuttings for me 
Disclaimer: I am Scottish, and as such the the chats with random people, acquaintances and their pets are not something I feel the need to or can avoid!