You never appreciate them until they go down on you. edit: computers
A hundred dollar bill.
Shine a torch in her ear!
He wasn't using protection.
He threw out all the computers with "dy" on them.
Seizure salad. edit: fixed the word 'call'
Vultures attack first, when you are dead.
Because they don't appreciate random people knocking on their door.
Answer in comments so you can fully appreciate the joke)
