To save electricity this is a nice tip.

This cartoon  and joke is from RD cartoon capers.  RD-INDIA

There are three men sitting in the waiting room of a hospital. 
A nurse walks over to the first guy and says, “Congratulations. You’re the father of twins.” 
“What a coincidence,” he says. “I work for Twin City Federal Bank.” 
A while later, the nurse comes out to congratulate the second man. “You are the proud father of triplets,” she tells him. 
“That’s funny,” says the new dad. “I work for AAA.” 
The third expectant 
father jumps up, a look of terror on his face, 
and runs out of the room. 
“Sir, where are you going?” the nurse calls out. 
He yells over his shoulder, “I work for Seven Up!”