I overheard a mom saying this to her kids during a thunderstorm at Clementon Amusement Park...
"Don't you know anything? Lightning is the electric shock. Thunder is the electrostatic discharge. Didn't you learn anything in school?"
I wonder what she learned in school, because lightning and thunder are defined below according to Wilkipedia...
Lightning is a powerful natural electrostatic discharge produced during a thunderstorm. Lightning's abrupt electric discharge is accompanied by the emission of light. The electricity passing through the discharge channels rapidly heats and expands the air into a plasma, producing lightning's characteristic thunder sound.
Thunder is the sound of the shockwave caused when lightning instantly heats the air around it to up to 30 000 °C (54 000 °F). That super-heated air expands rapidly, then contracts as it cools. The rapid expansion/contraction generates sound waves, making the sound that is called "thunder."
Because sound and light travel at different speeds through the atmosphere, one can time the interval between them to roughly estimate how far away the bolt of lighting is. The speed of sound in air is approximately 340 m/s (761 mph), while the speed of light is so fast that the lightning is seen only a few microseconds after the event, so the lightning is approximately one kilometre distant for every 3 second interval (one mile for every 5 seconds).
They're also the names of the trains in Lightning Racer.
I wanted to correct her so bad, but I laughed at her to myself and come on, it's Clementon Amusement Park!