George has to create Valentine Day's cards for all of his friends in order to show that he cares about them. He ends up finding a clever way to make many at once.
In this clip, Dr. Doofenshmirtz explains how his army of robots is marching to the beating of his heart. This is a figure of speech; it is not literally happening.
George ends up taking a job at the Glass Palace. There he cleans windows and ends up finding a room with items that have shadows of wild animals. He then paints the objects and creates a colorful room.
The Titans don't appreciate Rainbow Raider's art and instead make fun of it. The Titans get put in another world so that Rainbow Raider can make the Titans realize that his art is real and pure.
Going to the pool on a hot summer day can be a great way to cool off. But, make sure that you follow the rules of the swimming pool, so you and the people around you are safe!