It wasn't very funny, because there were bad puns throughout So Totally spaced out. For example: Timmy Turner! You have Re-Turnered!
I just don't get it. And this was kind of bad too:
Timmy says-Deafeating these guys will be a piece of cake!
And then it shows Vicky eating cake. To some little kids, that might be funny. But it's not as funny to the older audience. I'll give it a 5.5, because the second half - Microphony - was actully pretty funny. And one more thing: Why did his parents think that Timmy would enjoy a new breakfast cereal more than an allowance?