MEME REFERENCE

dr evil pinky

Use for a smug, knowingly mischievous reaction when an idea is devious, tempting, or suspiciously convenient.

What it expresses: A speaker recognizes an appealingly devious possibility and signals quiet scheming rather than open menace.
Example: A coworker suggests scheduling the difficult meeting for a day the manager is away, and you reply with this to acknowledge the crafty workaround.
When not to use it: Your friend directly threatens to hurt someone; the playful scheming tone would trivialize a serious threat.