I manifest joy.

Joy does not come when it is called, but it can be made much more likely, the way you make rain more likely by moving to the west coast. Sleep, company, music loud enough to be slightly rude, an afternoon with nothing scheduled in it.

It tends to arrive sideways, while you are busy with something else — laughing at nothing much in a supermarket aisle at half past six on a Thursday. Arrange the conditions, then stop watching the door.