LexX said:

I think it's really funny that mostly in the US you are so customed using brands. It just shows how important all the advertising etc. is there. Few that comes to mind here are Post-its and some weird people call all colas Coke.

Beat me to it. Post-its and Blu-Tack were next on the list.

Some of these are due to advertising and market dominance but others are there because they were the first and only company making those things. By the time the competition got there the name was synonymous with the product.

Coke is a strange one. People don't tend to call other colas Coke, but will order Coke instead of cola unless they prefer something else. Ordering a drink as 'bourbon and Coke' rather than 'bourbon and cola' is probably the most common substitution.