I would say quite a lot happens on Trial Lessons, it sets the tone for the attitude that the student has for the rest of their training, should they take it up. It's not something I'd do by choice but never say never.
It is however significantly safer than doing a swap over with the engine still running. There were a few deaths in the last couple of years from engine running changeovers and people falling into spinning props.
If you have to experience MJ in a kilt clambering over the top even more unsettling Especially if what they say about Scots and Kilts is true.
Oh my dear god