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So, this is not exactly a guide, but I think this replay details well enough how someone should play Singed if they're inclined to be a troll, get most kills, demoralize the enemy team (or, at the least, a specific enemy champ), and have a wonderful time doing it all.
I'm sorry that there's no conversation from TS or monologue thrown in as it's just a replay. It's roughly 30 minutes. Enjoy!