Remember the pet tarantula in Home Alone (1990)? Didn't it always give you the willies?
Well it gave actor Daniel Stern (Marv, the Wet Bandit) the willies too, and he stipulated that he would put it on his face for ONLY ONE TAKE. I give him credit for that, because I woulda been like "CGI that motherfucker, there ain't enough money in the world to make me do that."
The scream was dubbed over later because it would have scared the tarantudemon if he had done it then and there. And what does a scared tarantula do? I wouldn't wanna find out. Because you know what a scared Angie does? Shits her pants.