Dan Campbell just had the best introductory news conference EVER ... the new Detroit Lions head coach delivered an epic speech -- promising his team will bite off knee caps!!
Campbell met with the media Thursday for the first time since Detroit hired him to be its new leader ... and the fiery former NFL tight end provided no shortage of sound bites.
Campbell cussed, dropping an S-bomb -- and then he guaranteed his Lions players will be some of the toughest on the planet!!
"Here's what I do know," a fired-up Campbell said.