Freak Ripening

This is third yellow tom that has ripened off the vine.  Am aware that commercial produce is ripened off the vine everyday but they use chemicals.  There are no chemicals here, so have aliens attacked?  Does city water have growth chemicals?  Strange things are happening here....  Along with the three yellow toms, two grape toms have done the same.  Census stated that they tasted the same as the others. 

Skin Update:  Yes yellow tom skin is still tough but not as bad as before.  Think tough skin was due to excessively large tom size.  Fruits are ripening closer to description image now.