Having a tired, bummed out morning, looking for some live performances on Youtube to cheer me up, and I found this. It's probably not *quite* as impromptu as it seems, but wow, it's just a vocalist with a shaker and a tambourine, a guy with a ukelele, and a dude playing a wooden box. Pretty damn good:
As a young friend of mine said recently, "Train has never recorded anything that wasn't silly, and that's actually a compliment: I can use some silly a lot of the time."