Cillit Bang
From The Maze Where Realities Converge - the psychedelic encyclopedia of reality from The Ultimate Comment
Cillit Bang is a cleaning product with apparently magical powers. It was the subject of a notable ad campaign in 2005 featuring a fictional presenter named Barry Scott, which was reminiscent of American advertisements and infomercials rather than the abstract brand name promotion normally seen in UK and Ireland advertisements. Its active ingredient is possibly phosporic acid, according to its wikipedia article.
Its ad campaign's anachronistic presentation, and the product's inexplicable name, created a viral marketing effect, and the Cillit Bang meme spread all over the Internet, with some people creating flash animations and songs in honour of the ad, even appearing on the Ultimate Comment forums.
There is a completely pointless and insignificant game played by Ultimate Comment affiliates which involves inquiring of someone "Cillit Bang?" and, when they become confused and ask for an explanation, repeating the entreaty in various tones.

