— Вызовите отца на дуэль.
— Никогда!
— Но почему?
— Во-первых, он меня убьёт, а во-вторых…
— И первого достаточно!
Everyone, who wants to learn how to use "хватать", should also learn "достаточно" (short adjective). It also demands Genitive, but often (it seems, mostly for the Present) we should prefer it over "хватать". Here you just can't say "И первого хватает!"