The feel of the sun beating down on naked skin is beautiful and should be encouraged, not sure about Meatloaf or Michael Bolton though.

The plant that you used in your brownies could be a wild form of mint. Perfectly safe to use but can have a laxative effect if you use too much.

Also I think it can grow quite rapidly. A house a few doors down from me had it growing, it took over the whole house. A couple of nice men from Vietnam came and bagged it all up and took it away in a transit van. I asked them what the plant was and they told me it was Wild Mint.