Talk about a groovy opening weekend: Austin Powers in Goldmember debuted at No. 1 with a shagadelic $73.1 million the best bow ever for a comedy. Mike Myers's third go-around in bell bottoms also ranked as the best July opening ever and beat the $54.9 million opening tally of 1999's Austin Powers: The Spy Who Shagged Me. Last week's No. 1, Road To Perdition, fell to second with a still-solid $11 million. Its three-week total stands at $65.6 million. Rounding out the top five: Stuart Little 2 (No. 3 with $10.7 million), Men In Black II (No. 4 with $8.7) and K-19: The Widowmaker (No. 5 with $7.3 million). Disney's theme park ride-turned-movie The Country Bears debuted in sixth place with a less-than-bullish $5.2 million. The Mouse House better hold off on that Liberty Belle Riverboat feature.