Most surprising discovery/secret/unlock/experience in this game?

[Dirty Duck]

Accidentally moving my PS3 controller and seeing how that affected Rose during codec calls in MGS4...

Edit: just realized this thread is about mgs3. My bad :I

For mgs3 my favorite hidden mechanic that I found is probably the healing radio stations.

(I had forgotten about that MGS4 one!)

The healing radios are great-getting the codec number from interrogating guards was a real surprise the first time.

[Roger]

I guess for me is the codec calls you get depending on where you are or what you have equipped. Hearing a 5 minute talk about a cardboard box between Sigint and Naked Snake was stupidly entertaining for me the first time around. Knocking out Naked Snake with the cigar spray or handkerchief was also pretty hilarious. And also the Johnny Akiba grandfather bit was pretty damn hilarious haha. Anything secret I honestly can't recall that hasn't been said here.

[BigBrother]

Definitely the fact you can skip The End fight in two ways. Get out a sniper rifle or just change the game clock. Goes under the radar in how genius this is as a gameplay option. Was this also possible in Delta does anyone know?

[Departed]

The most surprising was the fact that there are still mechanics I'm discovering to this day, with Delta. Like how you can throw a bee hive on The Pain's platform to attract his hornets and leave him flustered, and then you can pick up that beehive after you kill him. Or the fact that you can throw snakes at Ocelot, which, for whatever reason, I never tried to do at any point until recently. The other one, I never bothered using until Delta due to how seamless camo swapping is, and that's The Sorrow's camo. It is an absolute godsend when you want to zero trace a corridor or grapple an enemy. Combing it with The End's camo during the second Ocelot Unit fight if you skipped The End makes zero tracing all of Sokrovenno so gratifying.