The Merry Month of April - S3.E29

Income tax time, so Alex decides to save money and prepare his own taxes this year rather than have Harvey do it. When Alex figures out he owes money, he gets mad about a hat he thinks Donna bought for $49.50. When Harvey arrives at the Stone residence, having done Alex's taxes anyway and announces that Alex will be getting a refund, Alex's attitude becomes very pleasant indeed!

Turns out Harvey's wife Nora had Donna buy the hat, but it was for Nora!