When you've co-evolved with birds to spread your seeds since their beaks don't damage them but then some mammals show up with their teeth that crush seeds when they eat your fruit and so you evolve defense mechanisms that are painful to mammalians to keep them from eating you and damaging your seeds so you can successfully reproduce and ensure your genetic survival but then some big apes come along and for some reason really enjoy the side effects of your defense mechanisms and so start deliberately cultivating you to eat even more of you but as a consequence you are even more prolific than you ever were with the birds
