The number 8 (八/捌) can be pronounced two ways in Taiwanese :

  • pQeq (poeq, peq) (vernacular)
  • pad (literary)

8 (pad) is considered a lucky number in Chinese culture because it = sounds like the word "prosper" or "wealth" (hoad).

See http://en.wiktionary.org/wiki/%E5%85%AB#Min_Nan