Install a spark good grade arrester. You might want to also consider a chimney cap or a chimney pot, both of which tend to keep out birds, bats, squirrels, mice, raccoons, snow, rain, leaves, and other unwanted debris. Some chimney caps are also designed to correct chimney backdraft problems.
an umbrella
I don't get why, but it's an umbrella
A chimney.
What may go down the chimney up but not down the chimney down?
an umbrella
An umbrella
The answer to the riddle "What goes up the chimney down but can't go down the chimney up?" is an umbrella. When an umbrella is closed, it can be pushed up the chimney, but when it's open, it cannot fit down the chimney. This clever play on words highlights the contrasting states of the umbrella.
an umbrella
Smoke
Smoke
santa comes down the chimney
An umbrella.