Today I saw off a colleague who was leaving the company. Before she departed, she asked me to book her a ticket to Hubei.

She said she'd transfer me the money once she got on the train. Seeing how rushed she was to catch the metro, I went ahead and booked it for her.
Then what happened? She got on the metro, I waited. She got off the metro, I waited.
By the time she was almost at the ticket gate, I'd urged her five times over more than an hour, and not a single cent was transferred.
Honestly, my heart sank in that moment. Fine, I stopped pushing. I processed a refund.
I had just completed the refund when her phone calls started coming in like machine gun fire...