Why did the jack-o'-lantern go to the party?

Because it was a gourd time!

Why did the skeleton refuse to go to the haunted house?

Because he had a bone to pick with the admission price.

Why did Frankenstein's monster get kicked out of the library?

Because he kept reanimating the classics.

Why did Medusa finally get a haircut?

Because she was tired of all her split ends turning to stone.