Michael Strahan was a nightmare for quarterbacks during his playing days, but even defensive legends can fall for good old-fashioned Halloween pranks ... 'cause the Fox host was scared s***less on live TV!!
Strahan and the crew were talking ball ahead of Sunday's games ... debating which teams are currently the scariest in the league.
With Halloween just around the corner, the crew figured it was the perfect opportunity to scare Strahan -- and his reaction was priceless!