It is really a good thing that they didn't ask me that question. I'd have probably ended up in jail for saying something like "to protect myself against a-holes like you."
Operations like this reinforce my opinion that every gun owner should have at least one gun - and all related ammo and accessories - that isn't on paper. Buy it from another gun owner who's not an FFL, or buy an antique - both for cash. Of course, I have yet to follow my own advice :>)
Being caught with such a firearm in the Glorious Commonwealth of Massachusetts will land you in jail for 1 year. Mandatory.
Gad, I hate this frakkin' place.