fall flat (on one's face)
to be unsuccessful, to fail
My attempt at humor fell flat and now the girl does not like me.
I fell flat on my face when I tried to impress the girl with my story.
Top American Roadside Attractions
Mystery Spot Santa Cruz
During a drive through the redwood forests of Santa Cruz, California, tourists often stop to witness firsthand the effects of suspending their own disbelief. The Mystery Spot is 150 ft. in diameter and features a slanted shed that visitors wander through and witness strange variations of gravity, such as an object rolling up a plank rather than down it. The Spots web site speculates that aliens planted metal cones in the ground, scrambling the areas terrestrial physics. After taking a guided tour, visitors can puzzle over whether this is truly paranormal or an optical illusion, and then trek on through the Redwoods.