Yet another Ppruner, asks: "What's the O in BOUMFISH/BOUMFAH?". I have not a clue. Perhaps he should Google it? Maybe if general aviation flying school checklists weren't so illogical and lengthy, confusing mnemonics would go out of vogue.
Perhaps a Ppruner ought to try google before admonishing another Ppruner to use google?
The only thing Google will tell you is what
OBUMMMFITCHH means. A checklist so fantastic that it tells you to both open and close carby heat.