Oh god, the old vehicle mechanics where you had to press the Y key to start moving. That was genuinely one of the most jank implementations of vehicles ever.
I can't remember when exactly I joined for the first time but I suspect I found Roblox sometime in 2009. I loved browsing the catalog and seeing all the unique items that people made and trying to get every single thing with the limited supply of Tix I had. Absolutely blew my mind how much creativity there was with the selection of games and user-generated shit like shirts and pants. Thrillville was something else, I remember I'd join and immediately get assaulted by the loud ass sound of the airlift thing.