Here are a few of my favourites:
Retteb, si flahd noces eht tub,
but the second half is better.
Doctor Reubenstein was shocked and dismayed when he answered the ringing telephone, only to hear a strange, metallic, alien voice say,
"Yasec iovn eilacilla temeg! Nartsa raehoty lnoenoh pelet gnig, nirehtde rewsnaehn ehw. Deya! Msid! Dnadek cohssaw nietsne buerro, tcod?"