I've been amazed while watching an anime series when suddenly, not only once but twice, characters from other anime series appears then disappears in the scene in a blink for example:
Hayate the Combat Butler- frequently almost all episodes has a cameo
Baka Testo Shouganjuu- Hayate Ayasaki and Nagi Sanzen'in are playing around in the Love Letter episode on the back scene
Full Metal Panic 2nd Raid- "L" riding a bike and Misa Amane appeared in front of the barbershop where Sousoke was getting a haircutter
Lucky Star- I seen a Botan-kun doll beside Kagami in her bedside
Does anyone know some other animes that have these surprising appearances???
Hayate the Combat Butler- frequently almost all episodes has a cameo
Baka Testo Shouganjuu- Hayate Ayasaki and Nagi Sanzen'in are playing around in the Love Letter episode on the back scene
Full Metal Panic 2nd Raid- "L" riding a bike and Misa Amane appeared in front of the barbershop where Sousoke was getting a haircutter
Lucky Star- I seen a Botan-kun doll beside Kagami in her bedside
Does anyone know some other animes that have these surprising appearances???