Anything produced by EA, Nintendo, Microsoft, HP or Apple. I give a pass to the iPad, tough.
Any video game consoles and their games.
Any car from an American or French automakers. (past traumas still run deep)
HD kind of motorcycles (nothing against the brand, it's just I prefer "rice bikes")
Any kind of sea food, if I'm living in a place 100 or more km away from the coast or rivers.
Non-german sausages
Non-southern European wines (tough California Wines are nice to the palate)
Beer sold at near-frozen temperatures (you know why they do it, right?)
I don't buy any music cd's, dvd's, blue-rays, as well.