never thought I'd see you here!

(one) never thought (one) would see (someone) here

Said when one is particularly shocked or incredulous about someone's arrival. Well, I never thought I'd see you here! What brings you to my Bible study group? Honestly, your mother and I never thought we would see you here.
See also: here, never, see, thought
Farlex Dictionary of Idioms.

(I) never thought I'd see you here!

I am surprised to see you here. Tom: Hi, Sue! I never thought I'd see you here! Sue: Hi, Tom. I was thinking the same thing about you. Bill: Well, Tom Thomas. I never thought I'd see you here! Tom: Likewise. I didn't know you liked opera.
See also: never, see, thought
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • (one) never thought (one) would see (someone) here
  • cover
  • grab (someone or something) by the throat
  • grab someone by the throat
  • grab someone/something by the throat
  • grease someone's palm/fist, to
  • get someone's dander up, to
  • help (someone) along
  • help along
  • die on (someone or something)