Bribeable humans may refuse an initial sum of money you throw at them, with 50% chance. Usually they say “It would take [some number of] zorkmids for me to abandon my duty!” which you can then provide if you wish.

If a guard is killed in a vault, immediately respawn all the walls of the vault. (Any creatures on the squares where walls are being rebuilt get displaced off them to nearby squares.)

Vault guards have specific responses to other names you might give them, such as “the Wizard of Yendor”.

If you tell a vault guard that your name is Croesus, and you are wearing gold armor, they might lead you out of the vault without forcing you to drop any gold. The chance of this outcome increases for each piece of gold armor you are wearing.

You can scare off a vault guard by telling him your name is one of the demon lords. This has the same effect as if you couldn’t say anything, so you’re still trapped in the vault after he flees. The -1 alignment penalty for lawful lying still applies.

Vault guards grudge leprechauns.

Give a YAFM for telling a vault guard your name is Spartacus.

Telling a vault guard you are Croesus or an alias might fail, depending on your Charisma. If it fails, the guard becomes hostile.