A scoreboard objective with stat.walkedOneCm keeps counting up while you are standing on the same field as a mob and not moving. This situation can (as far as I know) only happen in creative and when the mob is pressed in a corner, as the mob or player would else be repulsed.

Steps to reproduce:
Spawn any mob in a corner of a wall and walk against it in creative. Watch your stat.walkedOneCm counting up while not moving.