If we're talking bout the very first time with a rock instrument, barring the ubiquitous class Recorder etc. It's middle school and the last day of the summer term and the school wanted to quickly put on a little show. "If anyone can do anything, sign this form"! was the carrion cry from Birch the head.
So for a laugh myself and my mates cut out some cardboard guitars, got up there and mimed to 'Get It On' only there wasn't enough cardboard so I grabbed a snare drum, sticks and two chairs and proceeded to bash along to perplexing gasps from around the hall....I was actually playing a pretty groovy backbeat to everyones amazement ( I did bash some biscuit tins at home so had an inkling) Not sure I fully realised what an important moment it was but it probably cemented my need to take the electric instrument thing seriously.