Took my sister in law up and she did the same - giggles all the way through until about 10 minutes from the end. She was crapping herself so I think it was a hysterical thing but it didn't bother me, just laugh along as well and put your arm around the girlie, blow in her ear, call her darling and then start rubbing her up a little bit and..... err... scrub that.
VFE.