What's brown and sounds like a bell?
Riddles!

A travelling salesman pulls up a farm road, approaches the farmhouse, and is greeted by the farmer's daughter...
Howdy Maam, I couldnt help but notice that one of your pigs has a wooden leg! Why is that?
Oh, I love that pig! Did you know that that pig saved our lives! Our chimney caught on fire one night but he kicked up such a fuss and woke us all up in time to get out safe!
Very fortunate Maam but why does he have a wooden leg?
And another time he warned us about a fox trying to get into the henhouse! I love that pig!
The wooden leg?
Just last month he warned us about an oncoming tornado! We all just got into the cellar in time!
Why does your pig have a wooden leg?
A travelling salesman pulls up a farm road, approaches the farmhouse, and is greeted by the farmer's daughter...
Howdy Maam, I couldnt help but notice that one of your pigs has a wooden leg! Why is that?
Oh, I love that pig! Did you know that that pig saved our lives! Our chimney caught on fire one night but he kicked up such a fuss and woke us all up in time to get out safe!
Very fortunate Maam but why does he have a wooden leg?
And another time he warned us about a fox trying to get into the henhouse! I love that pig!
The wooden leg?
Just last month he warned us about an oncoming tornado! We all just got into the cellar in time!
Why does your pig have a wooden leg?
You don't just eat a pig like that all at once!

Power outage, lift stops.
Or: noticed there was no button for the 13th floor (common in US buildings due to superstition), decided to see if there was a missing door in the staircase.
Or: pushed the wrong button in the first place - ah, that's the answer you're looking for: he's a dwarf, can't reach the button for 15.
Oh, that's what Mosai meant :)
What has four legs and tricks .... Dog?