Ran at the gym (boo!) after work thanks to unpredictable thunderstorms all day. And I drank half a beer beforehand at my boss' 50th birthday celebration, so my hopes weren't particularly high for this run. Turns out it was great. And I saw a rainbow on my way to the gym - a big, full arc. Awesome.
Maybe there's something to the drinking/running combo. These guys seem to dig it.