oh it happened to adults too? hehehe. i thought to kids only or at least to those who don't understand english (that what 'any' means).
i remember long ago when my nephew was about 5 years old (he's now 20) he already started using the computer for games and kids' programme. at one programme, it mentioned 'press any key' so we told him so - "just press any key" and he asked us "where is the any key?"