A few come to mind.
Had a punt arranged in Brum, told the Mrs where I was going, as I like to have a cover story as near the truth as poss. She pipes up, oh good, I think I'll come with you and do some shopping! hastily cancelled punt.
Managed to finally get all the ducks in a line and arrange a 3some with my 2 regulars. Get a text on the morning, one of their kids had been sick all night and wasn't going to school!
(Still trying to rearrange that one)
Went for a long bike ride and ended up with a sore red arse, looked like a baboon, so had to cancel next days punt as I thought it would put her off licking my balls!
Couple of weeks ago I'm on final approach, texted for flat number and phone died on me!
Had a couple where I've texted to say I'm outside, only to get no reply, but I don't regard that as an unusual thing, that just comes with the territory.