these are from my friend Rich Pering:

 I WENT TO A BOOKSTORE AND ASKED THE SALESWOMAN, “WHERE’S THE SELF-HELP SECTION?” SHE SAID IF SHE TOLD ME, IT  WOULD DEFEAT THE PURPOSE.

IF A DEAF PERSON SWEARS, DOES HIS MOTHER WASH HIS HANDS WITH SOAP?

WHAT IF THERE WERE NO HYPOTHETICAL QUESTIONS?

IS THERE ANOTHER WORD FOR SYNONYM?

CAN VEGETARIANS EAT ANIMAL CRACKERS?

WHY DO THEY PUT BRAILLE ON THE DRIVE-THROUGH BANK MACHINES?

IF THE POLICE ARREST A MIME, DO THEY TELL HIM HE HAS THE RIGHT TO REMAIN SILENT?

WHAT WAS THE BEST THING BEFORE SLICED BREAD?

IF YOU TRY TO FAIL, AND SUCCEED, WHICH HAVE YOU DONE?