I was listening to Bullseye's best comedy of 2014 earlier and Nadia Kamil has this great bit about combating street harassment which resulted in this shirt. I checked her website and they're on sale for £15, with some of the proceeds going to charity, and now I kind of want one.
From the shirt's description:
"I like going running, but I find that often when I exercise outdoors I get a lot of harassment. I found I had men shouting at me and cars and vans honking at me. What fun it is to be a woman!
So instead of getting annoyed with this behaviour I decided to turn it into a positive. I made a t-shirt that said "Honk if you love feminism"