Dude, where's my rain barrel?

This is a story from earlier this month of the Funniest Thing Ever:

Two younger guys come to the door--probably selling some kind of service. The dog is barking like mad, but when I get to the door I can hear them talking. So I don't open it, I just spy through the peep hole and listen:

Dude 1: (in a totally DudeBro voice) What the hell is it?

Dude 2: (same voice) It's a bath tub. huh huh.

1: No it's not, it's a trough. For animals.

2: But he* doesn't Have any animals...

(both remove caps and scratch heads)

2: Dude! It's to catch the water from the Rain!!

1: Oh YEAH!! Look at the rain gutter going right into it!

2: Dude, he uses the Rain water INSTEAD of the hose to water his lawn.

(They both look around)

2: But, um....he doesn't have any lawn.

(much laughing)

1: Still, dude, it's pretty damn smart...