While ALPA's got folks who can fly,
Those in ALPO explore the night sky.
But Alpo does not;
It's the dog food you got
With your pooch, from the dog-kennel guy.
ALPA is the Air Line Pilots Association, ALPO is the Association of Lunar and Planetary Observers, and Alpo® is a product of Purina, a wholly-owned subsidiary of Nestlé S.A.