Why was the staircase so sad?
Because everyone walks on them.
How did the Asian couple name their child?
They dropped pots and pans down the stairs and listened to the noises.
Where was Stephen Hawking during the house fire?
The top of the stairs.
What is black and sits at the top of the stairs? -- Steven Hawking after a house fire.
Chuck Norris uses elevators only in case of fire.