tomfoolery (n.)

• antic
• balderdash
• baloney
• banter
• blatherskite
• buffoonery
• caper
• claptrap
• foolery
• fooling
• frolic
• harlequinade
• hogwash
• horseplay
• lark
• malarkey
• poppycock
• rubbish
• shenanigan
• trick
• twaddle