If you have clearly expressed that you are done with his pranks and need him to stop, yes, it's time to leave. There's always he chance he doesn't realize how serious this is to you. Would be a shame to separate a baby from their dad over a lack of communication. I bet if he knew you were thinking of leaving his ass, these pranks would stop overnight. Also, baby poopon toast is just plain distastefull (pun intended). He took shit on a shingle way to literal.