Adsense picking up keywords quickly, to shoot out relevant ads, in MOST cases

[Modee]

For the most part it's uncanny how adsense picks up on the content on a given page and shoots out relevant ads. For example go here:
Caller ID spoofing - Free EBAY, PayPal, Business and Law Forums - Ebay Suspension, PayPal Limited
to a thread about Caller ID spoofing and there it is: a banner ad about changing your Caller ID:




But I went to read a PM I got today, and the ads are in German! lol

Leben im Ausland! Was it something we said? Achtung!