Mystery in the Garden

Looking out of my living room window as I opened the curtains this morning, I spotted a round green object on the lawn.

I at first took it to be an apple, but yet, where had it come from, I`ve no apple trees in the garden and neither has my neighbour, and even if there had been wind it would have surely been too heavy to have come from far.

My next thought was that it was probably a small tennis ball, but yet again, where could it have come from.

On going out to investigate, it turned out to be a green tomato ! - but the mystery still remains - where has it come from? I`ve no tomato plants in the garden, and haven`t bought any. Has it dropped in from a passing plane, or helicopter?

Or, has Dave thrown one of his tomatoes which haven`t ripened, over to here?!!