A Colonel in the Guards was notorious for failing to pay his bills on time, if ever.
One of the debt collection companies was giving him a hard time and inundating our Colonel with letters and phone calls. In exasperation he wrote back:
I feel that I should advise you that my bills go into a hat, and at the beginning of the month, I draw out one and pay it in full.
If you continue to pester me, I shall no longer enter your bill into my hat."