In the credits, "Barks and Roars" are attributed to Maise, Trent's dog at the time of recording. At 3:36, barking and "Ow! Fucker" is heard being played at half speed over the track, as Maise - then a puppy - was playing with [[Sean Beavan]] in the studio, and bit him. (One of the recording techniques employed on both "Suck" and "Physical" was to play the guitar riff at double the speed of the track, and play the resulting recording back at half speed, for a unique, extra thick sound.)
According to a previously unreleased interview Reznor did with ''Melody Maker'' magazine, "Physical" was supposed to be a "tongue-in-cheek" [[Cover Songs|cover]]. It should be noted that the Adam and the Ants version is named "Physical (You're So)" and features an extra verse.
==Appearances==