These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Speech synthesis on on very primitive hardware which usually sounds like a hybrid of Microsoft Sam and buzzsaw.
Surprisingly good quality audio playback through the PC speaker (an output device not really intended for playback of digitised audio).
True Art Is Angsty: While neon glowing cubes and techno music are the best-known side of the demoscene, there are plenty of demos which are more... demanding on the audience's tastes. Whether it's long, drawn out slow moving scenes or an explosion of white noise, the critical reception will usually be spectacularly polarised - no doubt a result of the demoscene community being evenly split between artists and technology fetishists.