"Pirates of the Caribbean: At World's End," grossing $155 million in ticket receipts, hauled in U.S. box office treasure during the Memorial day weekend.

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"Pirates" displaced "Shrek the Third," which took in an estimated $53 million at the box office and slipped to No. 2 for the four-day period that kicks off the summer season.

"Spider-Man 3," with an estimated $14 million, was in third.

Newcomer horror film "Bug" opened at a distant No. 4 with $3.3 million.

"Waitress" climbed to No. 5 from No. 12 with $3 million in estimated receipts.

In sixth was "28 Weeks Later," with $2.4 million.

Rounding out the Top 10 were "Disturbia," $1.9 million; "Georgia Rule," $1.8 million; "Fracture," $1.2 million; and "Wild Hogs," $1 million.

The receipts were reported Monday by Box Office Mojo.