I love this confession:
One of the Macs my local CompUSA had out on display in its Apple ghetto was a G4 Cube. I had read somewhere that they ran hot, so one day I put my hand a few inches over the Cube to feel the convective flow rising out of the top grille. The machine immediately overheated and shut down to protect itself.
Let me be clear (as clear as the Cube). I didn’t put my hand on the grille—it was at least 3–4 inches above it. But that was enough. And from that day forward, every time I passed that Cube, I put my hand above it and caused a crash.