Had a rather unexpected thing happen this christmas which definitely fits in this thread.
I visited and spent christmas with my parents like I use to, and had my laptop along with my Hifiman HE-400 & D1 DAC/Amp with me. I've had audio equipment with me before, though HE-400 are my best headphones so far. My mother got a bit curious about he HE-400 and wanted to try them, probably the looks that intrigued her. She listened to a couple of her favorite tracks over Spotify and was truly amazed, kept saying how different it sounds compared to the crappy mini stereo she usually listens to. This made my father curious aswell, so he listened to some Creedence Clearwater Revival which is his absolute favorite band of all time. I could see he truly enjoyed it, and after listening through Who'll Stop The Rain and Bad Moon Rising he took the headphones off and just stated that "this is how it's supposed to sound". Keep in mind neither of them have ever been into audio nor listened to anything particularly high quality, as far as I know.
After this my mother asked if she could use the headphones and the D1 for a bit longer along with my Spotify account and I obviously let her do so. I think she must have sat for over 2 hours just listening to music, apparently she went through most of her favorite songs and then started to re-discover music she used to listen to when she was younger (it was the first time she used Spotify too). So anyways after this, she asked about "that other headphone pair you're going to sell", which is my DT-990 Premium, I had apparently mentioned that in some phone call before. I said I still got them and was planning to sell them after christmas. "If they sound anything like this I'll buy them" she said.. extremely surprised I said that she's going to need a dac/amp too to get them sound right, to which she responded that it's no problem. Later on we decided that I sell my current D1 to them.
So yeah - my parents aparently got into personal audio all of a sudden and I got to upgrade my source
Mailed the DT-990's to them and bought myself a Cambridge Audio Dacmagic Plus.