Marcus: Mmm, now, what else ... Ah! Armor! Armored targets, like these damned Hyperion robots, can take a lot of damage ... unless you've got a corrosive weapon.
Competitor: Weapons may only be sold by Hyperion representatives. All non-Hyperion arms dealers will be forcibly relocated to Jackville.
(If any other than corrosive weapon is used ...)
Marcus: It'll take way too long to break through armor with bullets alone! Armor is resistant to most damage types. Use your corrosive weapon!
(Vault Hunter fires at the target with a corrosive weapon.)
Marcus: See how that acid eats through the metal? I must confess -- I love corrosive weapons.
(Vault Hunter turns in the mission to Marcus.)