There are many but interacting with the Wall-E looking character the very first time to learn the basics was incredible to me. I kept saying out loud, "Oh WOW! Oh WOW!"
Sitting in the DCS Spitfire cockpit and actually feeling nervous to start her up in case I broke something. Spent ages just giggling at all the 'sticky out' switches and controls. Followed by the real stomach churning feeling as I watched the ground fall away as I eased up off the runway.