Behind the bush

A little boy was in church with his mother when he started feeling ill. 

Little boy: Mommy, can we leave now?

Mother: No

Little boy: Well, I think I have to throw up!!!

Mother: Then go out the front door and around to the back of the church and throw up behind a bush

After about 60 seconds the little boy returned to his seat.
Mother: Did you throw up?

Little boy:  Yes

Mother: How could you have gone all the way to the back of the church and returned so quickly?

Little boy: I didn't have to go out of the church, Mommy. They have a box next to the front door that says, 'For the Sick.'