Any word yet on invalidating/negating clicks from ones' own IP/PC. I had a mishap here with my nephew clicked on an ad ..i quickly emailed Google and got a positive response from them, but frankly he's on vacation and dont wanna take the PC from him so if this is not a possibility, maybe i'll head over to the local hardware store and lock him in the basement while im out of the house... j/k
Don't worry about an accidental click or two, AdSense blogged about this If you don't trust the people using your PC not to click a bunch, I would install an ad blocker.
I guess informing them won't work, coz i email them about suspicious activity on my a/c. Doing this also they disabled my a/c and i haven't got any reply email after google disabled my a/c
I suggest you disallow that site if you're going away, I mean disallow the ads on that site - Check Adsense Setup page and goto "allowed sites".