"Questions You Hope Your Pupils Won't Ask You" joke

Why doesn't glue stick to the inside of its bottle?
Why are there flotation devices under plane seats instead of parachutes?
Why are cigarettes sold in gas stations when smoking is prohibited there?
Why do you need a driver's license to buy liquor when you can't drink and drive?
Why is lemon juice mostly artificial ingredients but dishwashing liquid contains real lemons?
If 7-11 is open 24 hours a day, 365 days a year, why are there locks on the doors?
If a cow laughed, would milk come out her nose?
If nothing ever sticks to TEFLON, how do they make TEFLON stick to the pan?
If you tied buttered toast to the back of a cat and dropped it from a height, what would happen?
If you're in a vehicle going the speed of light, what happens when you turn on the headlights?
If it's zero degrees outside today and it's supposed to be twice as cold tomorrow, how cold is it going to be?
Have you ever imagined a world with no hypothetical situations?
How does the guy who drives the snowplow get to work in the mornings?
You know how most packages say "Open here"? What is the protocol if the package says, "Open somewhere else"?
You know that little indestructible black box that is used on planes? Why can't they make the whole plane out of the same substance?
What do you plant to grow a seedless watermelon?
When sign makers go on strike, is anything written on their signs?