She tells them that she will give the student who skips the quiz whose name comes first alphabetically a detention. This student won’t skip because they know they are getting a detention if they do. The next person alphabetically will then know that they will get a detention so they won’t skip either, and so on.

Dracula is a vampire and it was a solar eclipse but his watch said it was night. So the sun came out after a few minutes killing him.

Gravity.

He has 5 children, all of the daughters have the same 1 brother.

The vine won’t grow any vegetables, a tomato is a fruit! But the vine will grow 21 tomatoes.

1000, if you multiply all of the fractions everything cancels out except for 1/10.

A pack of cards.

Only allow one prisoner to turn the light bulb off and all of the others turn it on if they have never turned it on before. If they have turned it on before they do nothing. The prisoner that can turn it off then knows they have all been there and saves them all when he has turned it off 99 times.

He already put sugar in the coffee so when he got it back he could taste it.

Just drain the water like always.