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Just a few days ago, some aphids had infested the entire Cilantro plant with eggs (overnight!). I frantically doused the plant with soap+water and that successfully annihilated all of them by the next day. I squished their brown bodies and smeared their pulp all over the plant as a warning to future attackers. The following day, all the dead larvae had turned black. I decided to leave the dried, black corpses on there for whatever reason.
Yesterday, I spun Cilantro around and look what I found:

A ladybug! Predator of the aphid. It might have been attracted by the dead aphids. I hope it fed on some of them and laid many eggs to spawn an anti-aphid army.