Not all surprises sound the same. Depending on your project, you might need:
Exaggerated, cartoonish "Whoa!" sounds, often used in YouTube vlogs or memes like the Kuplinov Surprise Sound .
A popular Russian-language resource that offers specific clips like "Crowd Reactions: Admiration, Surprise, Disapproval" and short memes.
A massive global database. Use search terms like "crowd gasp," "audience surprise," or "surprised reaction." Most files are under Creative Commons licenses.
If your scene is in a hall or stadium, add a "Large Hall" reverb effect to the sound clip so it fits the environment.