You can surprise your friends by "predicting" what everyone will get. When you finish any activity, wait till the mission complete timer goes to zero. Start spamming R1 to change to the reward screen and it shows you what everyone got. Tell them what you "predicted" and once they get to the reward screen they say "wat" or "howww" or "Wow you're so cool." Ok maybe that last one isn't going to happen but it's still pretty funny. Try this out while I just hope my friends don't see this.