Some examples at random: percentage of males in teaching professions, and/or daycare?
Breast cancer funding and research versus prostate cancer funding and research, despite the relative frequency of each? Hint - 1:6 men will get prostate cancer, 1:8 women will get breast cancer. But the National Cancer Institute allows for $1,318 worth of research into prostate cancer per new case, and $2,596 for breast cancer (http://well.blogs.nytimes.com/2008/03/06/cancer-funding-does...)
Just some thoughts...