Which two letters are missing?

Unable to attend the funeral after his Uncle Charlie died, a man who lived far away called his Blonde brother and told him, 'Do something nice for Uncle Charlie and send me the bill.'
Later, he got a bill for $200.00, which he paid. The next month, he got another bill for $200.00, which he also paid, figuring it was some incidental expense.
But when the $200.00 bills kept arriving every month, he finally called his brother again to find out what was going on.
'Well,' said the Blonde brother, 'you said to do something nice for Uncle Charlie.
So I rented him a tuxedo.'