Had a couple of silly JavaScript canvas things from 10 years ago that I wanted to show someone, so I uploaded them to my web server, sent a URL, and it just worked.

Really bugs me that had I written them in a Real Programming Language, it would've probably taken 30 minutes just to get them to build again due to deprecated APIs and tool churn, and even then would only run on the platform I built them for, would have to send them the binary, deal with codesigning... 😑