I've got a laptop with a touchpad, and if your finger strays onto the bottom edge of the pad, it generates mouse wheel events. It's quite easy to drift into that zone when you're moving the mouse pointer which can be a pain, but generally doesn't make much difference.
Anyway, in this case I was moving the pointer over the buttons on the main screen and one of them fired as if clicked. That could have been explained by me accidentally tapping the pad and generating a click, but the button fired several times in succession, which usually means mousewheel events.
I'll see if I can replicate it a bit later - I don't have the lappy to hand at the moment.
[edit]
Confirmed. If I put the pointer over the game save button and run my finger over the scroll area on the trackpad, I get about a hundred queued save button events
[edit]
Anyone else find that girls captured in the catacombs occasionally arrive dead?