Kaboom
The nazi-zombie mode in Call of Duty: World at War is a real delight. Four players defend a spot against wave after wave of undead. To aid in their quest, a number of power-ups are dropped by zombies returning to the grave.
One power-up in particular kills all the zombies currently alive - “Kaboom”. But it doesn’t do it immediately. It announces the power-up and then waits a couple of seconds before doing the deed.
That tiny pause does so much. It prevents any fleeting “what just happened?” confusion, creates a moment of anticipation, and lets you make the kill you’d just lined up - doubly satisfying, as it’s then unnecessary and vindictive. It’s a lovely little detail.