* To be different: The band wanted to stand out in a sea of other bands and make their name memorable. The period is unexpected and adds a quirky element.
* A play on words: "Fun." could be interpreted as a shortened version of "fun," a feeling of enjoyment, or a suggestion of a period of fun (like a party or a concert).
* A reference to the "period piece" genre: The band's music has a somewhat retro feel, possibly referencing earlier eras. The period could be a nod to this.
Ultimately, the band members haven't publicly explained the reason for the period. It remains a fun, enigmatic part of their identity.