The test flight of Falcon Heavy (when they sent the Tesla Roadster to space) is still the most memorable launch for me. Watching those 2 boosters land side-by-side simultaneously looked like magic.
Yes. The whole office broke what they were doing and watched that launch and landing together, on one of our big displays. A cheer went up when they landed, side by side--a moment I'll remember for the rest of my life. Goosebumps then, and goosebumps now. Felt like the most significant thing for manned space since maybe Apollo (well, definitely since early days of the Shuttle!)