Ho ho ho!!! Way to go!
Its not Bitcoin, but I once paid for an x-ray at the main hospital using cash, I can be super convincing if I want to.
Of course I brought exact change which is what the nurses use to fend of most people. Then I demanded a receipt...
What I got was a handwritten note, which is highly illegal in the legacy world of course!
I pondered if I should file a police report for this huge state entity not following all of these book keeping laws & shit, but let it slide.
These days? I would have trolled them until the end of time!
I do look forward to when Bitcoin will be on everone's mind, where its real money that statist fuckers will drool to get, that is when the real fun will start :-)