If you want to make it even better, try swapping his face onto the video! Imagine sending him a video of him saying really stupid things. You can't wait to see his reaction. You can make it look very realistic using tools like the one shown here:
https://wishapp.ai/ . Just put his face into some silly video and watch the chaos! Professional advice: First, make sure he's sitting down. Trust me, I tried it with my cousin, and he almost cried with laughter (after the initial panic).