A two-headed alien. What other possible explanation could we come up with to justify this, other than Sally's imagination?

And I don't know about anyone else, but frankly in the original movie I found this guy much more annoying than Jar Jar.

Transcript

Dan: {single alien head close-up} Good morning sports fans, and welcome to the Boonta Eve Classic.
Dan: It promises to be a thrilling race, and joining me here in the commentary box is Olaf Annodue.
Olaf: {single alien head close-up} Hello Dan.
Jar Jar: They'sa joined together?
GM: Er... sure, why not.
Jar Jar: Wowsa!
Dan: {both heads now shown joined to a single body} Replacing the Junkyard owner Watto will be his young slave Anakin, competing in his first race.
Olaf: Let's hope it's not his last! He's a brave lad indeed; human beings are notoriously squishy.
Dan: We are a hilarious fellow, to be sure!
Olaf: Shouldn't that be an hilarious fellow, Dan?
Dan: Shut your cakehole you festering pillock.
Olaf: I'm sorry... I'm so sorry. Please don't hit me.
Shmi: Um, do you need some time alone?
R2-D2: I think Sally broke the GM.