First solo in a T31 like so many others on here. I was the first ab-initio in a new club to go solo so it was a historic event. Don't remember much about it except the briefing "You'll get a higher launch, so use up the height practising your turns!" We had great ex-ATC instructors, wonderful teachers.
The one I DO remember was my first solo in a glider with a canopy - the club Olympia2b. Claustrophobia big time. I was used to feeling the wind in my face. I had over 50 launches in my log book (in the Tutor) by then so not really a big deal. That was another first for that club. I was scared I'd break the Oly which only the instructors had flown up till then.
When I became an instructor I always used that briefing for a first solo, Must have sent well over 200 folk solo in my time.