Hah! Nice.
I remember when I was still relatively new in early vanilla, was like lvl 30ish on my druid going through SS/TM field. And suddenly noticed “Immune” pop up on my character’s picture. Was like “wtf?” It happened again. Looked around and sure enough a mage few lvls unter me spamming poly on me lol. Danced in front of him till he oomed then I killed him rofl.