A woman bought something from me yesterday, through Facebook Marketplace. She messaged in advance to ask if cash would be ok, and I said a bank transfer would be far preferable, as I rarely carry cash these days. She saw the message and didn't reply, so I assumed that was ok.
She turned up to collect the item and only had cash on her 
I accepted the cash, thinking that I could use it to pay for something in town later.
In town, I discover that the cash has somehow fallen out my bag 
So it's a loss all round for me.
What's a relatively trivial irritation you've had to put up with lately?