Disclaimer: I know it's GNU/Linux but I'll be referring to it as Linux for short.
The first time I remember reading something about Linux was around 1998, while sitting on the toilet on my friend's house.
There was a pile of magazines near the loo and one caught my eyes. I can't recall exactly what it was but I think it was about the fusion of Mandrake Linux with Conectiva Linux forming the new (at the time) distro, Mandriva Linux. At that time, I knew nothing about Linux at the time but, as I flipped through pages and pages of blue screenshots, I was hooked.
From 99 to ~2002, I remember seeing my friend's brother installing Linux on his desktop a few times. I also remember playing around on KDE on his freshly installed Suse Linux and, maybe in 2003, I remember mindless typing my first apt get commands and breaking his installation of Kurumin Linux 'cause it messed with some dependencies or something. Good days :)
The first time I installed Linux on a machine I owned was in 2004, the same year I bought my first computer with my own money. It was the Kurumin Linux wich was huge in Brazil at that time. Kurumin was one of the first live distros (that I know of) so it was easy to play with without breaking (too much) stuff.
From 2005 to the present day, Linux (mostly Debian Stable with i3wm) remain my main operating system and I only used other OSs on work related tasks, like Windows on a work machine between 2010 and 2013 for .NET development and MacOS on a few old macs for iOS development between 2014 and today.
That's it for this post. There are more interesting stories like when Canonical was giving away free installation CDs and I ordered some to sell'em on Brazil's equivalent of Ebay ๐
or when in 2009 I made an unsolicited "port" of a DOS program of the softhouse I was working on to "work" on DOSEMU (or DOSBox, I don't remember exactly). It probably wouldn't work in production but, man, was it fast.
Now it's your turn.
PS: thanks @hodlme for creating the Linux territory!