When my Dad read LotR aloud to us, I'm not sure how much he knew about the languages. So thus, I learned these words as:
Seleborn
Izzengard
The Izzen
Izzledur
Andooin
Anduhril
etc. (I still stick with these pronounciations.
)
He also didn't bother with the elvish poems, and I vividly remember his rendition of the Black Speech:
"Arsh Glarsh Arsh Glarsh Arsh Glarsh!"
Ah, memories.