In early 2017 I bought breakfast every day on my way to work in Oxford with cryptocurrencies. A bacon and avocado sandwich, and a large latte. It was pretty cool to buy these items with currencies I had mined myself, or bought by trading minded coins for other currencies. I checked the other day and each of those breakfasts would be around £200 today had I saved them but I don't regret the nerdy enjoyment of paying in that way :)

Edit: I found it amusing when the cafe closed a year later presumably because both owners retired after selling at the peak in early 2018.