Gintama 2x08: When Looking for Things You've Lost, Remember What You Were Doing on the Day You Lost It
Gintama 2x04: Stress Makes You Bald, but It's Stressful to Avoid Stress, So You End Up Stressed Out Anyway, So in the End There's Nothing You Can Do
Gintama 1x43: Make Characters So Anybody Can Tell Who They Are by Just Their Silhouettes / Since It Ended a Bit Early, We're Starting the Next One