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\"As you can see,\" explains Garner with a laugh, \"I am having a great time.\" She also sarcastically claims Ortega is the \"nervous wreck\" and she's the one providing comfort.

The most comical part of the shoot is that Garner is constantly calling her costar by her real name, Jenna, instead of \"Katie,\" her character in the film.

\"I don't really believe in being in character,\" snickers Garner, \"I like to live in the moment.\"

The 47-year-old provides a series of priceless reactions, from panicking as she hurtles toward a complete inversion to shrieking uncontrollably. She also assures that she's \"not taking the Lord's name in vain. I am beseeching the lord.\"

The video abruptly ends as Garner's expression rapidly dissolves from fear, to confusion, to downright incredulity upon the moment she realizes \"that the second hill's bigger than the first.\"

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