The context of the following conversation is Kai was grounded for two weeks and felt really guilty about what they did to their parents.:
Kai says I probably shouldn't have dressed up as a clown and scare my dad.
The friend responds probably a bad idea since your dad is having heart problems lately.
Kai responds I thought it would be a funny joke and not scary at all.
The friend responds you know your dad told you he was scared of clowns ever since he was a kid.
Kai responds I guess I didn't think he would be that scared though.