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
santa comes down the chimney
an umbrella
Smoke
Smoke
An umbrella.
An umbrella! It can go up a chimney when it's down because it's thin but cant go down a chimney up because its too big!