Toxoplasma gondii may help promote the entrepreneurial spirit?
independent.co.uk
independent.co.uk
This article has appeared in several guises - such as exposure to T. gondii causes impulsive risk-taking behavior more generally.
I have several friends who have been highly exposed to cats, but not sure how many of my other friends have not, so no control group AFAIK.
EDIT: If you aren't aware, t. gondii is spread by cat feces as their normal lifecycle uses cats and mice.