I call bullshit.

If you have a box full of large insects crawling over each other sitting on your lap, you will not think it is a box of chocolates, because boxes of chocolates rarely, if ever, feel the same as a box of large moving insects.

This is reinforced by the fact that though you might be startled by finding a box of chocolates is in fact a box of cockroaches, instinctively you would not throw the box up in the air. If you were in the kitchen you might just drop the box, but in a car you would be likely to put the box on the seat beside you and get out of the car.