Maybelline Dream Matte Mousse
Fun fact: this didn't actually launch until 2005, but I bet a lot of people reading this associate this stuff with their first forays into foundation. Maybelline Dream Matte Mousse (£7.99) was a revelation for oily skinned teens. The only problem? Most of us are a lot better at application and colour-matching than we were back then and it led to a lot of chalky, orange faces.