(though often it's a bit spoiled when realizing: unintentionally.)
Except! the little tale related here, re Canon and the gratis L-1A SLR camera rebuild; that still can generate an endorphin or three. Still, even one such surprise does serve to remind moi about expectation-bias. {sigh}

Likely you recall an ancient tale (so likely apocryphal) re Rolls Royce. An unlucky owner stranded by broken axle in some unpronounceable locale; R&R flies a mechanic with parts. On return to Blighty the owner drops by to pay bill--it's the Decent thing to do! ... R&R: Rolls-Royce axles do not break.

False? but it's got cuth, beats the shit outta the Lying Liar's lie-of-the hour. Comparisons.