Bugs Bunny meets Trix Rabbit

One two-part commercial has Bugs Bunny show up to help the Trix Rabbit, the former being upset that the cereal has no carrot flavor bits. Unfortunately, Bugs' plan is just as flawed as all the Trix Rabbit's, in contrast to his usually well-engineered schemes against his adversaries. To further rub it in, Bugs is actually shown enjoying a bowl at the end of the second part while the Trix Rabbit remains Trixless.

Example of:
Special Guest