This is a category for the various one time gags executed throughout the How I Met Your Mother series.
One Time Gags refer to any gags in the series that are only mentioned and only occur in one episode. Most of these gags are of a humorous nature, however they do not have to be. If the gag is mentioned in multiple episode, or takes place over multiple episodes, it becomes a Recurring Element.
Although Ted's fight with the goat only occurs in one episode, because reference to this fight is made in several earlier episodes, it is considered a recurring element.