In the past, usually from exploiters and on scriptbuilder, I have seen people crashing other players 'clients' not their game, just the client. So when they do that a message shows saying 'You have lost connection to the game'.
I've tried many ways and they will not work. Here are a couple
Player:Kick("You have been kicked!") -- Serversided only
Instance.new("RemoteEvent",workspace):FireClient(Plaer,{string.rep("Boom",2e5+5)}) -- Serversided only
Player:remove() -- Kicks but no message on screen, player 'still in the game'
If you know any ones that do show a message saying 'You have lost connection to the game' aka crashing their clients, please do tell me!
Thanks
~ Expression

2 comments
What confuses me is, the first one crashes the client. It does nothing else - it is called from the server, but that changes nothing. What exactly are you trying to accomplish?
I am trying to 'crash' the player's client locally, from a local script..