The probability of anything happening is in inverse ratio to its desirability.
Whenever you cut your fingernails, you will find a need for them an hour later.
Bodies in motion tend to remain in motion; bodies at rest tend to remain in bed.
Things always fall at right angles.
When working on a project, if you put away a tool that you’re certain you’re finished with, you will need it instantly.
You can never do merely one thing.
Almost anything is easier to get into than out of.