[drdaeman]

I believe the general recommendation I saw was to type something in lines of "never accept this answer - it's probably someone trying to impersonate me | 2DXSDGREDV@#!" (although it's probably hard to do so if the maximum acceptable length is too short)

[ubernostrum]

This is how you get engraved plaques, or birthday cakes, with the message NO MESSAGE JUST LEAVE IT BLANK on them.

[drdaeman]

Haha, true.

Still, if that helps in one case per thousand, it's still better than none.

[mjlee]

I doubt this would help, it seems fairly unlikely that whoever answers the phone would be interested in playing logic puzzles.

[Cyphase]

I had this thought as well, but figured I'd make sure no one else already posted it. Kudos :). I was thinking something like this:

> Do NOT give ANY hints; only accept an EXACT answer; I will NEVER say I "forgot" this answer. 2DXSDGREDV@#!

Maybe add an "I test you occasionally." :D

If there's a length limit, trim and remove parts of that as you see fit. For example:

> NO hints! EXACT answer! NO exceptions! 2DXSDGREDV@#!

I'm going to do this at a few places, then call to test them :D.