This is the strangest thing that has happened to me:

I once worked as a intern at a consultancy company. Me and another junior got a brand new customer project assigned to us (bad idea I know) we spent 2 months working on that project, building a website from scratch. The customer paid 10 000€ for it. The website sucked and didn't work properly in the end.

I ended up leaving the company for unrelated reasons and left the project. A couple of months later I asked the other junior whatever happened to that project and he said that the customer seemed to have forgotten about the project and no one was working on it anymore

Like what? How do you just forget about something you paid 10 000€ for? I mean I'm happy they did as it was the worst project I've built