off-the-wall

Adjective
  1. conspicuously or grossly unconventional or unusual
    • restaurants of bizarre design--one like a hat, another like a rabbit
    • famed for his eccentric spelling
    • a freakish combination of styles
    • his off-the-wall antics
    • the outlandish clothes of teenagers
    • outre and affected stage antics
off-the-wall
His off-the-wall antics always make his friends laugh.