In "The Secret War of Lisa Simpson" (episode 178), Bart connects several megaphones together in the Police Department and says "testing" into them, causing a massive sonic feedback loop which shatters every window in Springfield.
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Bart has to see a pychiatrist in the episode Yokel Chords- after telling a scary ghost story in the school cafeteria to get free food
'Marge Gamer' (17th episode, 18th season).
'Marge's Son Poisoning' (episode 5, season 17).
'New Kids on the Blecch'.
The name of the episode is Barting Over. It aired on February 16 2003 and is the 300th episode of the show.