Wary Stairs

This is a pun, where "up to something" is used to mean both 'planning something sneaky' and also that the stairs go 'up'. It plays on the dual meaning of the phrase.

• Something
• Architecture
• Stairs
• Building
• Warning
• Construction

• Why was the staircase so sad? Because everyone walks on them.
• I hate stairs. They are always up to something. I love stairs. They are always down to party.
• I have always been scared of stairs; they're always up to something.
• I was thinking of starting up a stair company, but there were too many steps to it.