Or if you have a limited supply of gunpowder but a way to make sufficient numbers of appropriately shaped projectiles, an air rifle would do the job and is much lighter and simpler than a trebuchet.
I looked into it. Yes, you're correct, I was wrong. Although there is a speed limit of mach 5 (theoretical, not reachable in practice!) for shockwaves in normal atmosphere.
One of the meeting rooms here at work has a couple of big panels for displaying presentations, and they're regularly misinterpreting noise on some line or other and changing their brightness/contrast/etc settings. It's highly annoying. I imagine there's some kind of data line plugged into the TVs which is picking up interference and causing them to freak out.
There was also an issue with Linux about 8 years ago where the THP daemon would start busy-looping searching for pages to amalgamate, wasting loads of CPU time (and I believe freezing the processes it was inspecting), and so people were advising switching off THP for that reason until it was fixed. It hit our large Java processes quite badly.
Software that tried to implement memory protection or virtual memory on the Amiga had to have a huge long hit-list of software that set the AllocMem flags incorrectly and had to be treated differently. That's because the MEMF_PUBLIC flag didn't really do anything on the base OS, so programmers didn't bother using it correctly.
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