Great 3 Stooges Running Gag: "I Didn't Know It Was Loaded" 

A Stooge thinks that a gun isn't loaded and holds it at something, then fires the gun to prove that it's not loaded. However, it is loaded and a bullet comes out and shoots wherever or whoever he was pointing the gun at. (ThreeStooges.net)
DISORDER IN THE COURT (1936)
SO LONG MR. CHUMPS (1941)
THREE LOAN WOLVES (1946)
BABY SITTER JITTERS (1951)
CORNY CASANOVAS (1952)
HORSING AROUND (1957)
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