If you say something in chat a ScreenGUI/A timer will pop up on your screen Anybody know how?

If you say something in chat a ScreenGUI/The timer will pop up on your screen Anybody know how?

Well, we could use the .Chatted event in this case to get the player who chatted and then do the code.

game.Players.PlayerAdded:Connect(function(p)
	p.Chatted:Connect(function(msg)
		-- code to make timer appear
	end)
end)

If you wanted it to be when the players type a keyword, you could just use an if statement checking whether msg was the keyword.

if msg == " " then -- put the keyword in the quotation marks
	-- code
end

Edit: oh ya, forgot to mention that this code might be done server side, in this case, use remote events and :FireAllClients.