My favorite one was when they were camping and warned Fat Freddy not to feed the bears.Freddy told them not to worry,he was feeding them some acid.They [Phineas and Freewheelin Franklin]took off running leaving Freddy getting bearhugged by one of the tripping bears.
LOL! I just remembered the dream that Phineas once had after eating all the hash brownies. It had something to do with the Brothers looking to pull off a bank robbery, and ended with Franklin waking Phineas up by whacking him over the head upon discovering that his beloved brownies were gone.