BUNG LUCK
Worse than "Dumb Luck", "Murphys Law","Bad Luck" etc etc.
Whenever anything CAN & DOES go wrong no matter what you do, say, don't do and whoever helps, no matter what help is given and/or available. If it's gunna stuff up, it will! That's "Bung Luck" for ya .... Awwwwww, "Bung Luck!"