A child who has won

It's the end of PAX, and we're pretty much out of swag except for a couple of things we're holding back. A dude walks up to the booth with a kid who looks about eight.

Dude: Would you happen to have any more of those nifty water pouches?
Gaby: Sorry, we're all out.
Dude: *incredibly crestfallen look*
Me: ...okay, convince me I should give you one.
Dude: I will use it to save a puppy from a burning building!
Me: I see no puppy. Are you going to trap a puppy in a fire just to save it? Come on, give me a better reason.
Kid: (quietly) I'll use it to save the environment by refilling it more than once.
Me: *tosses the kid a water pouch*