I've been taking a portion of my paycheck in Bitcoin (via bitwage) explicitly intended as spending money for a while. I buy things regularly with it. The payment flow using a mobile wallet is pretty great.
I mined hundreds of BTC in 2011 to 2012, and sold pretty much everything as I went. If I'd saved it all, I'd have "fuck you money" right now, but at the time even $100/BTC seemed like a moonshot.
I'm not going to beat myself up over not having prescient knowledge of BTC or any other thing I could have invested in.