"A watched pot never boils?"
Wrong. When the fucking sun's surface balloons out past the orbit of Venus, it won't matter who's watching. Not only that pot's contents, but possibly even the pot itself will boil off, depending on what material it's made from! And when that happens, don't expect it to hang around to call the kettle black, either. Watched or not, every pot boils.
Stop taking received wisdom uncritically for granted. Learn science.
Your beloved old saying is just plain wrong.