It's mean to wish someone dies when they wrong you.
Rob's father Brandon hasn't paid back a debt, so Rob is really angry and is talking to his friend Mary about it.
Rob wants to vent to Mary.
Rob is really angry and while talking to Mary says that he will just have a talk with Brandon and try to be understanding.
In the heat of the moment, Rob tells Mary that Brandon needs to just drop dead.
Rob has a talk with Brandon, and they work out a payment plan, so now Ron feels satisfied.
Later that evening Brandon has a heart attack and now Rob feels guilty.