The Yo Gabba gang learns firsthand why it's important to be nice by saying please and thank you.

Brobee knows that flowers make Foofa happy, so he gives her one. The flower does indeed make Foofa happy, but she forgets to thank Brobee for his thoughtfulness, and Brobee is surprised.  Later, however, Brobee asks Muno for a favor without saying "please." Plex must step in and explain why using these words means being nice -- and that's nice!