Mah-Mah's reading glasses.
Hey... I just wanted to prove something to daddy and mummy with this hypothesis: The degree of the damage correlates with the cost of the object.
The RM400+ one --- slightly curved
The RM20 one --- badly twisted but still intact
And the RM4 one --- Snap! Broken!
P.S - The 3rd victim was daddy's, quite some time ago. I broke one of the lenses when I banged it against the floor like a hammer. Too bad it wasn't captured and posted.