My good deed while I am wearing the invisibility cloak is i'm going to help people. I will walk into classes and give them answers on tests. So everyone gets A's. Then I will go to a fast food place and give kids food so they don't have to eat the bad lunches the school provides.
Then I would take teachers grade book and put A's. The last thing i will do is put a random guy on my shoulders so people will think he's flying.