I am going to have my friends try the hottest pepper in the world without them knowing it.
You can't be serious right now, why would you make them eat that?
I'm curious to witness who can handle it.
You are tricking and deceiving people on purpose and that is mean. Making someone eat something that could harm them is irresponsible and people will be angry at you as a result.
It's worth the risk.
I believe you should just ask them first, it can be a lot more fun when they consent and you can get it on video! You never know if they are allergic to it, so it's better to be safe than cause them pain.