London - This Is Spinal Tap has been voted the greatest movie comedy of all time.
The 1984 cult mockumentary - which was directed by Rob Reiner and featured a cast of unknowns playing a spoof band who made much of the script up on the spot - beat Airplane! into second place in a poll by Time Out magazine.
Time Out critic David Jenkins said: "It's sublimely funny and sharp - a comedy built for the long haul which matures with each viewing. It's so perfectly constructed and performed, the characters so rich and realistic, that it's initially a challenge to determine the dividing line between reality and fiction."
When Spinal Tap was released some viewers were convinced the fake group - which had a tendency to lose drummers in increasingly more bizarre accidents - were a genuine band.
Monty Python's Life of Brian came third while Annie Hall, Monty Python and the Holy Grail and Withnail and I also featured in the top 10.
Voters taking part in the poll included Ghostbusters star Dan Aykroyd, Shaun of the Dead director Edgar Wright and The Office co-creator Stephen Merchant.
Time Out's Top Ten comedy films:
1. This Is Spinal Tap
3. Monty Python's Life of Brian
4. Annie Hall
5. Monty Python and the Holy Grail
6. Anchorman: The Legend of Ron Burgundy
7. Withnail and I
8. Groundhog Day
9. Some Like it Hot
10. The Jerk