Outside of the instances to SM Armory (and probably cath)… you can be feared by the opposing faction causing you to run past the portal and into the outer world version of the instance… now thats annoying on its own of course… but you can also further be stuck and unable to move your toon if fear-walk into the weapon racks beyond the portal.
Pretty being stuck after walking past a portal after being troll-feared by the enemy faction is a little rediculous and unintentional.
TL:DR in sm you can get feared past the portal >>and stuck/trapped on a weapon rack… unable to move at all.