Quote Originally Posted by AntiochusIII
*boy, was it tempting to say snakes and a plane!*

cockroaches + anything else. Virtual assurance of survivability against chemical warfare, nuclear war, sound bombs, and anything under and including the sun. Of course, the disgust factor of cockroaches, the only creatures I openly support genocide of, would play in...
Antiochus beat me to it!

Cockroach + virus (although just an organism). Any animal who gets in contact get infected. If it is killed, it just stays dormant until another animal picks it up and get infected hence giving it life and ability to reproduce again.