I wear it often when I go birding. However, I only got a reaction from it on one occasion. At a natl wildlife refuge, I ran into some fellow birders who know me. We chatted amicably until she noticed my t-shirt. She went apoplectic, and started shaking and screeching about Kent State. I have no idea what Kent State has to do with Che. I just grinned, bid them farewell, and kept birding.
Fun stuff!
Thanks