Steal your friends phone (make sure you know the passcode) go into settings and change the shortcuts/ auto-corrects to words they might use a lot like OMG or ttyl or hi. EG. whenever they type hi it'll become gummy bears or when they write OMG it becomes on my grave or something weird like that.
Beware this could get very funny.
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Ultimate Pranks
RandomHas your friend ever pranked you soooo bad you just want to slap them right across the face? Do you want to get your friends back for all the humiliating things they make you do? Check out these pranks which are sure to give you a few death glares...