Both should be changed regularly, and both for the same reason.
One.
They're afraid of change.
Because I don't joke about jokes.
Thief: They steal your money then run Politician: They run and then steal your money
Incontinent
They both need to be changed after a while for the same reason
Because it's the reason for the sneason.
Someone who knocks on your door at 6 a.m. for no reason.