Gas servicemen

[rebbonk]

Two gas company servicemen, a senior training supervisor, and a young trainee, were out checking meters in a suburban neighbourhood. They parked their truck at the end of the alley and worked their way to the other end. At the last house, a woman watched the two men from her kitchen window as they checked her gas meter.

When they had finished the meter check, the senior supervisor challenged his younger co-worker to a foot race back to the truck to prove that an older guy could outrun a younger one. The co-worker accepted the challenge.

As they approached the truck in full stride, the two men realised that the lady from the kitchen window was huffing and puffing right behind them. They stopped in their tracks and asked the woman why she was running behind them.

Gasping for breath, she replied "I'm not stupid...

Spoiler:

when I see two gas men running that fast, I figure I'd better run too!"