While exiting at a station saw this lovely sign, which read: "ASS CHARGED WITH 33KV KEEP DISTANCE". There was a skull and bones on the notice too, in case you were left with any doubts as to just how dangerous the ass in question was.
Blury mobile phone snap in case you don't believe me
While I'm sure there might be more "sensible" (pfft) explanations, knowing Delhi, I'd like to think that this was a subtle warning to the ubiquitous public transport groper.