Grinch had so many people in make up - virtually everybody. We had about 100 people a day for five months. And every day we would use 100 sets of appliances. ↗
What you make up in your heads sticks if it's good, falls out if it's bad. If we still remember something a day after we made it up, it might be worth building on. ↗
I landed a job with Roger Corman. The job was to write the English dialogue for a Russian science fiction picture. I didn't speak any Russian. He didn't care whether I could understand what they were saying; he wanted me to make up dialogue. ↗