Variation on a theme

[lnr]

Tell me a thing which is true, and tell me a lie, but don't tell me which is which.

Comments

[rejs.livejournal.com]

House prices will fall over the next 12 months.
House prices will rise over the next 12 months.

[ewx.livejournal.com]

Is it still a lie if you don't know it to be false? I'm sure lying ought to involve intent.

[imc.livejournal.com]

Invalid - both are true.