Halloween

One of the most scarry holidays is Halloween! A lot of people are wearing in the costumes of mystery heroes, for eg: a vampire, a witch, a werewolf and another. The most popular symbol of Halloween is a pumpkin. It's very old symbol and there is a legend about it. A story about Jack-O-Lantern tells us about the origin of this tradition.
Do you know it???/

And I want to present a poem "Jack-O-Lantern"
Sometimes big and sometimes small
But always round and yellow
When children make your famous grin
Then you're a scary fellow.