A few observations (they are rather dull)
- I saw an ad for United Colors of Benetton, which was a pic of some women and men standing together in small amounts of colourful clothing and my first thought was "hey! that is an ad for Ubuntu"
- I saw a girl wearing a t-shirt with some message on the front, and my first thought was "Why is the t-shirt using courier font! It would be better if they used some serif font"