come out of nowhere
- unexpectedNot anticipated beforehand
- suddenOccurring without prior notice
- surpriseUnexpected event causing astonishment
- ambushSurprise strike from concealment
- blindsideSurprise with unexpected force
startle · appear · materialize · bolt · shock · jolt · lightning · whirlwind · abrupt · spontaneous · catch off guard · unpredictable · out of the blue · random · striking · swift · emerge · pounce
predictability/expectation
come out of nowheresee it coming