system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do the sounds of a crowd (clapping, cheering, booing,...) seem to unify the more people do it?

When a crowd claps, we only hear one loud - or a few - clap sounds, when the crowd cheers we hear a louder and unified cheer. Why is that?

PS: English is not my primary language, grammar might be horrendous to some!
gpt
Imagine your shower is slowly dripping water, and you put your hand under it. If you closed your eyes, you'd still be able to tell each water drop apart, because only one water drop is hitting your hand at the same time. Now imagine you turned the shower on. The water is still coming in drops, but there are so many at once, that you can't tell them apart. The tap of one drop is so close to the tap of the next drop, that it doesn't feel like taps - it feels like constant pressure. 

It's the same thing here. Your ears have tubes in them covered by little hairs. When sound enters these tubes, it shakes the hairs. These hairs are attached to nerves that carry a signal to your brain, and that's how we hear. A clap is a kind of sound that shakes a lot of hairs, but for a very short amount of time. 

When there are lots of claps, then each hair never stops being shaken by claps - they're constantly shaking, and can't tell one clap apart from another. Just like the droplets in the shower.