Next time you're out in the car with her, preferably on a highway, wait til she dozes off, then pull into a rest area and slowly roll up to a parked semi truck.
When you get to about 30 ft distance of the parked semi, start raising your voice...slowly..."OMG OMG...OH NO!!!" ... she's slowly going to wake up...at
15 ft, SLAM on the breaks, flash your head lights and let out a scream. Imagine her face when she abruptly wakes up....
Tested and tried, works like a charm if executed correctly. just make sure that she doesn't have a heart condition....
