"Spoiler Alert" is the eighth episode in the third season of the television series How I Met Your Mother and 52nd overall.
Ted thinks that he has found the perfect girl, Cathy (Lindsay Price) and decides to take her to dinner with the gang.
Barney offers to help but this is only a ruse to make him watch a video of a dog pooping on a baby – something Marshall is furious at him for putting a disgusting video over his friend's future, and, with Marshall angry at Barney and the whole gang annoyed with one another, the arguments reach a climax.
The argument is halted when the group mockingly sings one of Marshall's "nonsense" songs (Apple Orchard Banana Cat Dance 8 6 6 3); the song was actually a mnemonic device to help Marshall remember his password (aobcd8663 – it is not shown if it has upper or lower case letters) for the bar exam results website.
The group then celebrates with champagne at MacLaren's with each sliding back into their bad habits (Marshall singing his own praises, Robin using "literally" incorrectly, Lily crunching loudly on bar snacks, Ted making a correction on a comment and Barney saying "law-suit up!"