This made me laugh. How irrelevant is UFO's to shoe polish? Oh, so very. But it does tell me what I need to know - this polish gives you really shiny shoes. Which could be useful if there's a UFO-attack. ;) Euro RSCG Buenos Aires did this print ad.
[1]
Update! There's a TV commercial to go with this here:
Nugget Bright & Shiny - Since 1942 - (2008) :40 (Argentina)

[2]
Kudos: Gustavo Reyes, Executive Creative Director
Maxi Sánchez, Creative Director
Mariano Duhalde, Creative Director
Pedro Pappalardo, Creative Director
Ivan Zimmermann, Art Director
Rodrigo Raices, Copywriter
Links:
[1] http://commercial-archive.com/d138bfd7bb6f0663dcc71c6b82557c00/2008/apriljpgs/nugget.jpg
[2] http://commercial-archive.com/node/143324
[3] http://technorati.com/tag/commercials - other/misc. (ads)
[4] http://technorati.com/tag/press & poster ads