If you're going to talk to a smart assistant out loud in front of other people, at least give your shortcuts names which sound like like trashy thrillers.

Tired: Hey Siri, turn out the lights.
Wired: Siri, activate the Hades contingency. Alexa, initiate project Dædalus. Okay Google, proceed to omega phase.

Start with a dramatic action verb like "engage", "commence", or "execute". Throw in a mythological figure which needn't have any actual relation to the action set. Then round it out with a nonsense word from an espionage drama, like "protocol", "sequence", "directive", or so on.
@tilde I struggled mightily to find some way to get mine to consistently turn on the living room lights and tried lots of different wordings but it would do random unrelated shit most of the time (play something random on the TV, turn on a fan in a different room, whatever) and I got it to work more reliably by setting up the action "do alpha beta" as the code for...turning on the lights.... You need *two* Greek letters, though, if you only use one it will find something random to mishear and do instead!