Where do Incans go to sneeze?

Achoo Picchu

An Incan's daughter had a bright smile

I guess you can say her smile was Incandescent

What do you call the lights illuminating a downward Peruvian staircase?

Incan descent lights.

Why hasn't Peru adopted LED lights yet?

Because they are proud of their incan descent.

What is the difference between an old light bulb and a pile of salt?

One is an incandescent.
The other is Incan dessicant

What do lightbulbs and Peruvians have in common?

Incan descent

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