Spike sneaks into Zecorah's place and 'borrows' a special flower. Smelling it will make anda fall in Cinta with the first person anda see. Obviously he tries to get Rarity to smell it, accidentally infecting everyone in ponyville in the process. Eventually everypony's chasing Spike in a lovestruck stampede, causing Celestia to come down from her istana, castle to see what the ruckus is about. When she too smells the bunga and falls in Cinta with Spike all hell breaks lose.
Spike is forced to ask Zecorah for help. She creates a merah jambu awan of fog, that cures everypony. Luckily for Spike nopony remembers a thing. In the end he writes a letter to Celestia, about how Cinta is something that cannot be forced.