How do you say this will shock in french?

Here are a few ways to say "this will shock" in French, depending on the context and nuance you want to convey:

Formal:

* Cela vous choquera. (This will shock you.)

* Ceci vous étonnera. (This will surprise you.)

* Ceci vous laissera sans voix. (This will leave you speechless.)

Informal:

* Ça va te faire flipper! (This will freak you out!)

* Tu vas être surpris(e)! (You're going to be surprised!)

* T'es pas prêt(e) pour ça! (You're not ready for this!)

More specific:

* Cela vous donnera des frissons. (This will give you chills.)

* Cela vous laissera perplexe. (This will leave you perplexed.)

* Cela vous laissera abasourdi(e). (This will leave you stunned.)

The best translation will depend on the specific situation and the level of formality you want to use.