I recently visited an exhibition (at Questacon), where I saw a display that apparently exhibited the Coriolis effect.
There are four water jets coming out of pipes connected to a central spindle. Two pipes point out (NE and SW in the photo), and the other pair (NW and SE) are C-shaped, so the jets point in, towards the spindle. With the handle, I could rotate the spindle, which was solidly connected to the pipes.
Upon rotation, the outward-pointing jets acted as I would expect. The pipes were "in front" of the jets, with the jets themselves dragging behind (in terms of their angular position).
However, the inward-pointing jets were surprising to me. Instead of dragging behind the pipes, they instead appeared to push in front of the pipes.
I couldn't wrap my head around this. The explanation mentioned the Coriolis effect, but was unfortunately lacking in a more specific description. Why are the inward-pointing water jets "in front" of the pipes?