This one will out me but...
Many years ago I hooked up with DP and the next morning, after he'd left, I decided I wanted a bacon sarnie. But with all the pheromones in the air, I gaily strolled out of the flat, and didn't realise til after I'd shut the door that the keys were still on my dresser.
Now what to do? My flatmate was away for the weekend and I didn't have my phone so couldn't ring the landlady. Then I remembered the handyman kept a ladder in the cupboard under the stairs and, fortunately, I'd left my bedroom window open.
So I take the ladder out, put it against the wall, and realise I'm going to have to find a passerby to hold it for me. Around the corner comes the actor Simon Callow and his dog! So, it being Britain, I pretend I don't recognise him, explain the situation, and ask for his help.
He hastens to tie the dog to a lamppost and holds the ladder as I shimmy up it. In a denim miniskirt no less, but fortunate I remember he's gay!
I get to the top of the ladder and my windowsill hits me around chest height, so I realise I will have to literally haul myself in. So I start doing just that. At this point, Simon Callow starts shouting encouragement in the plummiest of voices - "That's it! Well done! Jolly good show" etc. It was the luvviest thing I'd ever heard, and I'm literally shaking with laughter as I collapse in a heap on my bedroom floor.
Anyway by the time I got downstairs he and dog were on their way off but I thanked him profusely.
And I've relished telling the story ever since!