Learning English

Here's a quick laugh.

Our house has 3 bathrooms: 2 upstairs and one down stairs.
The faucet in the downstairs one is difficult to turn on, so
Gregory usually hauls himself up the stairs to do his business.

Yesterday he burst into the kitchen and proudly announced,
"I peed down the stairs!"

You might say I was a little shocked. After a minute I realized
what he meant to say was "I peed downstairs", meaning he
used the ground floor bathroom. That was a relief.