Lots of menacing dudes mentioned, McClellan, Lt hvy Moorer and later had a special kind of 'scary random' going on, Duran and Tyson had that low key poker face and shark eyes that convinced you that your ass was kicked before they even left the corner. Its not always menace either..you have more obscure guys with reps or traits. Sure Valuev was limited and moved with the fluidity of a aircraft carrier, but would you want your face buried in that body hair? Golota based entirely on unpredictability. Facing bombers is bad enough but not knowing if he'd zombie bite you, billy goat ram you, smash the balls or all of the above is worse. Jeff Fenech, Jirov , Dempsey and Jorge Arce looked like guys coming to break your kneecaps. Oh, and Anne Wolf. Female, male or whatever..Wolf could def make you leave a puddle.