Sometimes, especially when explaining it to people, it's nice to skip the prefix and let them figure it out.

One joule is approximately energy required to raise a large apple (100 grams) 1 meter. It's also the kinetic energy in a 100 gram apple traveling at about 10 mph.

1 kWh is the energy required to lift 1 metric tonne of apples (10,000 apples, or more than 200 boxes) from the ground floor to the roof of the Empire State Building, 1250 feet (

calculation).

1 kWh is also the energy contained in

3,600,000 apples to 10 mph. Imagine being hit by an apple thrown at 10 mph. Now imagine that happening 100 times to 36,000 people. That's 1 kWh.

A gallon of gasoline has 33.7 kWh, so it's like raising 337,000 apples all the way to the top of the empire state building. Or it's like 1.2 million people being bombarded with 100 apples.