Because, you really should. The sheer surreality of it defies description.
So, right, there's Humbah, and Jumbah, and Jingbah, and Zumbah, not forgetting the charmingly orange Zing-Zing-Zingbah. And they're, um, basically...varicoloured whoopee cushions with limbs and heads.
They're also aliens, I think - at least, they arrive and leave in a strange sort of pod thing which suggests alien involvement.
What do they do? Well...nothing, really. I mean, if the Teletubbies were minimalistic in their approach to dialogue and action, Boohbah take that to the next level. They, um, jump up and down making whoopee cushion noises (pitched whoopee cushion noises, mind you) and then fall over, giggle, get up and repeat. Not twice, not a few times but for about five minutes straight.
Then some children appear with a present. They place it in the centre of a circle and blow on it until it becomes a special effect. Eventually it turns into something vaguely recognisable. The children say "A present for the story people." Then, we're introduced to the story people - Grandmama, Grandpapa, Mrs. Lady, Mr. Man, Brother And Sister, Auntie, and Little Dog Fido. They are transported to some scene or other in which some basic action takes place (for example, today little dog Fido was attempting to dig up a twelve foot inflatable bone, with the help of grandmama), all the while narrated by the most deadpan, nay, depressed sounding male narrator I have ever heard. And accompanied by comedy percussion.
Then the Boobah fall over some more. Then they get back in their ship thing and disappear over the horizon.
I've not remotely done it justice. If you want some vague idea of how surreal it is, visit the website (requires Flash) which is completely, utterly wonderful - but really, everyone ought to watch it at least once. Possibly while smoking something. It's one of the weirdest things I've ever seen on TV.
Sorry, just had to share that with you.