Best Comet story I heard.
On Dan-Air holiday flights, in the old days (of course), having the kids up to the flight deck while in the cruise was standard stuff.
Small boys would regularly ask "Does it have machine guns ?". To which the skipper would reply "Well, it does actually. Step forward here and press that for a moment", pointing to some innocuous switch on the yoke. The boy would hesitantly do so.
Meanwhile the flight engineer, seated right behind them, has moved his finger over the Stick Shaker Test Switch. Boy presses switch. FE operates Stick Shaker Test. Thump-Thump-Thump in the yoke. Boy is amazed. Crew smile.
Now on one occasion they were following another aircraft visible above them in the airway. Skipper extends his invitation to "See that aircraft ahead. See if you can aim at that". Small boy does as usual. Meanwhile the aircraft ahead by chance passes into a slightly different air mass and starts visibly jet-trailing where it had not before. Skipper says nonchalantly "Oh, there, good shot. You got him". But the boy is panic-stricken, and runs back into the cabin yelling.