A wildly popular comedian made some waves online on Tuesday ... when he revealed he dressed up as a stabbed Mark Sanchez for a Halloween party.
Benedict Polizzi -- an "FBoy Island" star who boasts 3.7 million followers on TikTok -- shared the 'fit on his Instagram page ... and it raised more than a few eyebrows.
Check it out -- Polizzi donned a No. 6 Sanchez Jets jersey ... complete with fake blood splattered all over his torso.