I went flying yesterday with a friend in my 1972 Grumman AA-5. She's a good copilot for someone who doesn't know much about flying. I showed her how you can pitch up and down, cause 0G, and float, which is fun. I did that when she was stretching in an awkward position to surprise her, but she took revenge and did it quite hard and abruptly while in cruise around 105 MPH without turbulence, which made us hit our heads on the canopy.

We probably didn't have our seatbelts tight enough. But could this have structurally damaged the plane? Should I tell my mechanic? It behaved normally afterward.