Volcano

I found this little gem on the local university's campus where there are no smoking regulations, probably because I live in a state that loves corporations and hates regulations. Lovely, isn't it? I think it sums up smoking (and a lot of other habits) quite nicely.
I was actually unsure whether I should categorize it as "humor" or "macabre/horror", so I chose "street".

(NOTE: description edited for clarity, 2017)