zapanjiti

1. to astonish; to amaze; to stun
   Njegov odgovor me je potpuno zapanjio. — His answer completely astonished me.
   Cene u tom restoranu su zapanjile sve turiste. — The prices in that restaurant stunned all the tourists.
2. (zapanjiti se) to be astonished; to be amazed
   Zapanjila sam se kad sam videla račun. — I was astonished when I saw the bill.

The cause is usually in the instrumental: zapanjiti se nečim; the participle zapanjen is very common.