It was hard to find a list of more of the social-issue-related ones, but this Japanese company makes these hilarious bras once a year to highlight social trends or issues.

This bra is a countdown clock that stops when a ring is set into it. It's supposed to be for the Japanese woman who is actively hunting for a husband, as recent trends show more and more women being proactive in searching for a mate.

Here's an article about it, http://www.reuters.com/article/lifestyleMolt/idUSTRE54C1E720090513

And here's a pic of it




A short list of some of the bras can be seen here, it's totally worth a look:
http://inventorspot.com/articles/best_8_bizarre_bras_triumph_inte_8275