Some actors come to network parties and leave shortly after the long walk down the red carpets.

Some stay to the very end.

Count "ER's" Linda Cardellini as one who's less interested in looking cool than she is in having fun.

Sunday night at NBC's Universal Park party -- held there because Universal and NBC are now one company -- Cardellini was still riding "The Mummy" -- for at least the second time -- nearly an hour after the party was scheduled to have ended.

Turns out she's a roller-coaster junkie. Sat in the front row. Didn't puke. Afterward, in the locker room where they make women stash their purses, lest they become part of the Egyptian-themed backdrop, she even pulled out a keychain picture of herself and her father riding the Coney Island Cyclone together on her parents' first-ever trip to New York.

But no, she didn't buy another to commemorate her ride with TV critics.