If I wash my car or water my garden, it’s bound to rain.
The moment I brag about never being sick, I spend the next day or two in the bathroom not sure which end to put down first.
If I mock someone for being a clutz I typically turn around and run straight into a wall, or fall down, or trip not-so-gracefully over something.
Worse than any other murphy’s law thing:
No sooner than I’ve WEIGHED IN for the week, I take the most ginormous dump! What is up with that?