A kiss is an affectionate expression seen in some episodes:
Phoebe
- in Amazing Feet Of Strength while watching Coop play soccer, Phoebe kisses a sign with Coop's picture on it
- in a Halloween episode Phoebe kisses Coop after he saves her from being crushed between spiked walls
- in The Kitty Vanishes when Coop keeps being teleported into Phoebe's party he exits with lipstick marks on his face, presumably from Phoebe kissing him offscreen
Fiona
- in Something About Fiona Coop kisses her to get her grounded
Other
- in Good Luck Harm when it brings him Fishy Frisky Bits Kat kisses the lucky amulet made from Burt's 12-leaf clover he's wearing
- Dr. K kisses Mr. Kat goodbye in The Kat Went Back Part 2.