“It’s very dangerous stuff. You can get killed with those things,” he said of tomatoes. He also said it was necessary for security to be “aggressive” in stopping people from throwing “pineapples, bananas, tomatoes, stuff like that.”
‘THEY WERE GOING TO DO FRUIT’
In new deposition transcripts, Trump defended encouraging rally attendees to beat up hypothetical protesters wielding tomatoes by claiming that projectile fruits can be lethal.
https://www.thedailybeast.com/trump-warns-of-killer-tomatoes-pineapples-and-bananas-in-court-docs

Wasn't this a Monty Python sketch? "Self-Defence Against Fresh Fruit" where the instructor was giving tips on how to defend yourself against people wielding fresh fruit and got annoyed when the attendees wanted to know how to defend themselves against knives or pointed sticks!
https://www.youtube.com/watch?v=F4PZXuk3TsM