I was playing a game IRL where my opponent had gotten Witches and Goons before I had Witches, so I was losing badly. Nonetheless, I managed to pull of a really cool TR turn.
I had Procession, Throne Room, Witch, Copper, Copper in hand. I Processioned the TR and TR'd the Witch for +4 cards. I picked up another TR+ Witch, so I used my second use of my first TR on my second TR and then from that one my second witch for another +4 cards. I then picked up a third TR and Merchant Ship, using my second use of my second TR on the third TR and Merchant Ship, giving +$4.
1 action to play 7 cards, giving +8 cards and +$4. Not bad in my opinion.