its really funny that zim acts like a normal kidXD but still screams really loudXD even without trying to not reveal he's a alien from the irken empire
I can just imagine zim being on fire and hes just screaming really loudly and then he jumps into a pool of water to stop it but inevitably realizes hes allergic to water and then he just screams his lungs out 💀
I remember hearing that occasionally, the directors would tell Zim's voice artist that they needed a few more screams. Then they'd leave the microphone on and go to lunch.