Why would you want to do something to them? Who cares if they block you?...js
Nothing. Move on...worse things have happened.
If you have school together just slap them
Don't speak to them
Or just avoid them
Don't think about them
Even if they do just pretend that it never happened
Also pray to god that they will unblock you or something
I don't know about 10, but here are 5 things you could do to punish someone who has blocked you on Snapchat:
1. Put their number on a listings website as part of an advert giving away free kittens. Their phone will never stop ringing.