One of the things about Castlevania is that there are lots and lots of goodies hidden all over the place with no indication that they're there. That makes finding them by accident kind of a rare occurrence.

Like this part of Stage 6, for example. It's the hallway that leads to the second boss, a giant Flying Medusa Head.

If you make your way to the fourth arch and stand in just the right place for a few seconds...

A moneybag will rise up out of the ground for a quick 1,000 points!

A couple of things to note, though: 1. The game is really picky about where you stand to activate the moneybag, and 2. There are lots of the smaller Flying Medusa Heads attacking you in their sine-wave pattern, which makes it tough to stand still for the few seconds required to trigger it.

But, there are plenty of people who are old hands at this game that might not know about it, so it's worth perfecting your technique to impress them.