Loudness of gunshots. Every action hero would be deaf.

Archers being told to "hold". Nobody's holding a +100lbs warbow.

Sprinklers. In the vast majority of cases they react to heat - not smoke. They only go off individually rather than all at once and the water inside the pipes is black ink-like rust water sludge, not clear tap water.

Also another plumbing related: you don't need a huge wrench under the sink and drains are not pressurized so there's no water spraying anywhere when you mess with the p-trap.