Between his latest film and The 40-Year-Old Virgin, the big four-oh is obviously an important number for Judd Apatow (and, presumably, many others). But the semi-autobiographical This Is 40 doesn't just see the famously self-obsessed writer/director looking back at his own life, it also sees him returning to one of his earlier films.

Billed as the "sort-of sequel" to Knocked Up, which is really just a fancy way of saying spin-off, This Is 40 follows Debbie (Leslie Mann), Pete (Paul Rudd) and their two kids (Maude and Iris Apatow) as the couple navigates turning 40, and all the mid-life crises that come with it.

But can This Is 40 top its "sort-of" predecessor, which went on to critical acclaim and big money at the box office thanks to Apatow's patented combo of R-rated humor and heartfelt sentiment? Or does it land closer to overly narcissistic Funny People territory? To find out, I crunched the numbers.

(Please note, like Debbie's stated age, the following numbers are subject to change without notice.)

Major characters who return from Knocked Up: 4 Minor characters who return from Knocked Up: 3 (including Debbie's gynecologist) Appearances by Bridesmaids castmembers: 4 Appearances by other Apatow former and current co-workers: 2 Appearances by Apatow's actual family members: 4 (including his grandmother) Appearances by famous musicians: 3 Appearances by members of the Philadelphia Flyers: 4 Mentions of Katherine Heigl's character Alison, Seth Rogen's Ben and/or Debbie and Pete's now-5-year-old nephew: 0

Times Debbie claims she isn't 40: At least 5 Age Debbie claims to be: 38 Actual age of Leslie Mann: 40 Actual age of Paul Rudd: 43 Actual age of Judd Apatow: 45

Fights (with each other): 7 total (both innocuous and justifiable) Fights (with others): 8 Heart-to-hearts: 4

Marriage jokes: 7 Age jokes: 8 Dick jokes: 9 Period jokes: 4 Lost jokes: 10 Lost clips used: 4

Percentage of the movie the characters spend bickering with each other: 60% Percentage of the movie the characters spend being nice to each other: 20% Percentage of the movie the characters spend talking about Lost: 20% Years since Lost has been on the air: 2

Cigarettes snuck by Debbie: 3 Cupcakes snuck by Pete: 4 Medical exams shown: 7 Pete's cholesterol level: 305 Moral high ground winner: Debbie

Children from second marriages: 5 Times a parent insults their own child: 8 Times a parent insults someone else's child: 7 Children threatened and/or yelled at: 3

Estimated copies Pete expects to sell of Graham Parker's new record: 10,000 Copies the record actually sells: 612 Money lent to Pete's dad: $80,000 Money stolen from Debbie's shop: $12,000 Mortgage payments missed: At least 1 Peter and Debbie's debt: High Approximate cost of Pete and Debbie's mid-movie spa trip: Several thousand dollars

Guys who fight over Megan Fox's Desi: 2, plus at least 4 members of the Philadelphia Flyers Percentage of screen time Megan Fox spends in her underwear: 50% Percentage of screen time Paul Rudd spends in his underwear: 15%

Elements recycled from Knocked Up for the "sort-of sequel": Characters, scenes, locations, and a few jokes Knocked Up runtime: 129 minutes Knocked Up Rotten Tomatoes rating: 90% Expectations: Set

Funny People runtime: 146 minutes Funny People Rotten Tomatoes rating: 68% Expectations: Lowered

This Is 40 runtime: 134 minutes This Is 40 Rotten Tomatoes rating (as of press time): 60% Expectations: Exceeded

'This Is 40' opens in theaters on December 21.

This Is 40 Movie Poster
This Is 40
Based on 39 critics

After many years of marriage, Pete (Paul Rudd) is the sole male in a household that includes his wife,... Read More

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