Not mine. From a long time ago.
Ed: You see a well groomed garden. In the middle, on a small hill, you see a gazebo.
Eric: A gazebo? What color is it?
Ed: [pause] It’s white, Eric.
Eric: How far away is it?
Ed: About 50 yards.
Eric: How big is it?
Ed: [pause] It’s about 30 ft across, 15 ft high, with a pointed top.
Eric: I use my sword to detect good on it.
Ed: It’s not good, Eric. It’s a gazebo.
Eric: [pause] I call out to it.
Ed: It won’t answer. It’s a gazebo.
Eric: [pause] I sheathe my sword and draw my bow and arrows. Does it respond in any way?
Ed: No, Eric, it’s a gazebo!
Eric: I shoot it with my bow. [roll to hit] What happened?
Ed: There is now a gazebo with an arrow sticking out of it.
Eric: [pause] Wasn’t it wounded?
Ed: OF COURSE NOT, ERIC! IT’S A GAZEBO!
Eric: [whimper] But that was a +3 arrow!
Ed: It’s a gazebo, Eric, a GAZEBO! If you really want to try to destroy it, you could try to chop it with an axe, I suppose, or you could try to burn it, but I don’t know why anybody would even try. It’s a @#$%!! gazebo!
Eric: [long pause. He has no axe or fire spells.] I run away.
Ed: [thoroughly frustrated] It’s too late. You’ve awakened the gazebo. It catches you and eats you.
Eric: [reaching for his dice] Maybe I’ll roll up a fireusing mage so I can avenge my Paladin.