A script that kills you when you press the button.

-- The script does not work in all games.
-- Please wait second version.

mouse = game.Players.LocalPlayer:GetMouse()

local button = "p" -- You can write another symbol

mouse.KeyDown:Connect(function(key)
    if key == button then
        game.Players.LocalPlayer.Character.Humanoid.Health = 0
    end
end)