#1. you were next going to club the owner over the head with the empty tank,
#2....or stand in the bushes and laugh hysterically as he has to go somewhere and purchase a fresh tank with his wife screaming at him loud enough for the neighbors to hear that he's "holding up dinner", and "I thought you said you checked the tank!!".
OMG, I laughed so hard I had to stop reading and catch my breath. That is the funniest post I've seen about this yet! I nominate you for Post of the Year.