Th-THUMP

[Kels]

Funny part is, ASCII himself seems to be variably mad.

[GreatLimmick]

That's probably mostly because he can (or at least could) dial down his emotions. A big part of how we expect other people to act is that we expect them to have emotional reactions. We know that not everyone has the same emotional reactions to the same situations, possibly different either in kind or in intensity, but we do expect those reactions to be present. A person who appears to lack emotions entirely would be positively bizarre and alien.

[Kels]

What's interesting in ASCII's case, he doesn't seem to feel physical pain at all (look at when Eliza skewered him before), thus making his empathy for others a bit of a stretch to start with, since he can't imagine their pain. With his emotions dialed down, as Rick said earlier, it breaks the social contract for him altogether, making him quite literally alien altogether. It's hardly a surprise he turned to mad science in the end.

[Tetramorpheus]

Although I think that this question has already been answered by an... authority, 'Th-Thump' could also be caused, if the bed frame was loose, by any... recoiling motion causing the 'Th-' and the release of said recoil causing the 'Thump'. Particularly if a bed was well used, its structural integrity...
::straightens tie::
Yes, well...

[Alfador]

Or even simpler: If the headboard of the bed is against the wall, and the footboard against the computer desk. Like mine is.

BackFORTH backFORTH backFORTH!

[GreatLimmick]

Or if the headboard is a completely separate piece (as is the case for at least one bed I've used).