Five-week-old film tops weekend box office

This is not normal.

Five weeks after its release, the low-budget thriller "Paranormal Activity" topped the box office this weekend with an estimated $22.0 million, according to BoxOfficeMojo.com

Movies typically open to huge audiences and then tail off week by week (unless you're dealing with a phenomenon like "Titanic") but "Paranormal Activity" is re-writing the record books.

Despite a no-name cast and one of the lowest production budgets in history, "Paranormal" may end up being the most profitable film of all time.

Made for just $15,000, it has already grossed $62 million in the U.S. alone.

Here's this week's box-office estimates:

WEEKEND TOP 5 STUDIO ESTIMATES, OCTOBER 23-25, 2009

Rank. Movie Title (Distributor)
Weekend Gross | Theaters | Total Gross | Week #

1. Paranormal Activity (Paramount)
$22.0 million | 1,945 | $62.5 million | 5

2. Saw VI (Lionsgate)
$14.8 million | 3,036 | $14.8 million | 1

3. Where the Wild Things Are (Warner Bros.)
$14.4 million | 3,735 | $54.0 million | 2

4. Law Abiding Citizen (Overture Films)
$12.7 million | 2,890 | $40.3 million | 2

5. Couples Retreat (Universal)
$11.1 million | 3,074 | $78.2 million | 3