I still think Leviathan is the best you can do with a manga
Two policemen walk in on pretty disgusting orgy:
"I:Hmm... Do we have to arrest them... We pour out some gasoline... and let this all burn; isn't that the best solution?
Y:You've got some good ideas... but that's impossible... we're the good guys...Hey it's police *no reaction*
I:I think I'll go buy the gasoline...
Y:Maybe that would be best..."
Yotsume and Inuhiko, "Leviathan"