A customer sent an order to a distributor...
A customer sent an order to a distributor for a large amount of goods totaling a great deal of money. The distributor noticed that the previous bill hadn't been paid. The collections manager left a voicemail for them saying, "We can't ship your new order until you pay for the last one."The next day the collections manager received a collect phone call,"Please cancel the order. We can't wait that long."

An invisible man is here to see you
Nurse: Doctor, there is an invisible man in your waiting room.

Doctor: Tell him I can't see him now. Next.