just as planned
A popular and often parodied scene from Death Note where Light Yagami revels in the completion of a long-winded plan. His evil grin and headset are frequently added to other characters as a joke after a successful plot.
Peripherally, has been frequently applied by the wargaming contrafraternity (such as fa/tg/uys) to Tzeentch, which has spawned a fair number of mutations in the execution.