Ok there really is no purpose or reason to flip text upside other than to confuse your friends or your readers.  What about writing an entire post with upside down text?  Well you can now flip your text upside using a simple code.

¡pɐǝɹ oʇ pɹɐɥ ɹǝdns os sı ʇı ɥƃnoɥʇ ‘uʍop ǝpısdn sı ʇxǝʇ ǝɥʇ ʇno sıɥʇ ʞɔǝɥɔ

The link to flip to flip text upside down? (link)