(Clanking sound) Did I hear something just now? ...Nah, must have been the wind. (clanking sound gets louder) Yeah, that's definitely the sound that wind makes.
— Hapless guard, Yu-Gi-Oh! The Abridged Series
No, all is still
In dale, on hill
My mind is set at ease
So still the scene
It must have been
The sighing of the breeze.
— Major-General, The Pirates of Penzance
People only say "I'm sure it was nothing" when they're sure it was something.
Soldier: Well, there is a crocodile with a gun, and I think it's looking at me...
Superior: Big deal!
Superior: It's probably just minding its own business! Leave that thing alone!
No matter how many shorts we have in the system, my guards will be instructed to treat every surveillance camera malfunction as a full-scale emergency.
Back into the chamber turning, all my soul within me burning,
Soon again I heard a tapping somewhat louder than before.
“Surely,” said I, “surely that is something at my window lattice;
Let me see, then, what thereat is, and this mystery explore—
Let my heart be still a moment and this mystery explore;—