Three builders are sitting on top of a building...

...when they decide to have lunch. The first builder grabs his lunch box.
"Every day for lunch my wife packs me an apple and I HATE apples. If I get another apple today, I'll jump." He opens up his lunch box and sure enough, inside is an apple. He grabs the apple, throws it as hard as he can and jumps.

The second builder says "Every day for lunch my wife packs me an orange and I HATE oranges. If I get another orange today, I'll jump." Opens up his lunch box and sure enough, inside is an orange. He grabs the orange, throws it as hard as he can and jumps.

The third builder says "Every day for lunch my wife packs me completely random objects. If I get another absurd object today, I'll jump." He opens up his lunch box and sure enough, inside is a hand grenade. He pulls the pin out, throws it as hard as he can and jumps.

Meanwhile, there is a police officer walking along the street. As he walks he sees a little boy lying on the side of the road, crying.

"Little boy, what is the matter?" he asks.
"An apple just hit me in the side of the head!"

Confused, the police officer keeps walking. Soon he sees a little girl lying on the side of the road, crying.

"Little girl, what is the matter?" he asks.
"An orange just hit me in the head!"

The policeman frowns but keeps walking. Shortly enough he sees another little boy lying on the side of the road, laughing uncontrollably.

"Little boy, what is so funny?" he asks.
The boy, still clutching his sides, stands up and says "I farted and my house blew up!"