I don’t like reggae

Usually, mashups take two songs you already like and combine them into a single hit-or-miss version. But I came across a mashup recently that takes two songs I don’t like at all and combine them into a pretty good tune. But the more important question is: How does anyone think of putting 10cc and Usher together?
Usher vs 10cc: Dreadlock Usher (mp3 – courtesy of chezlubacov)