I found a funny glitch on Spyro: jaar of the Dragon for PsX.
To activate it, do the following:

Go to any world with lava of any other kind of stuff that makes u hurt yourself. I prefer to do this in Molten Crater in the Sunrise Spring homeworld at the beginning of the level, but it can be done anywhere. Jump into the lava, keep burning yourself untill Sparx is gone. What u want to do now is hit the ava one meer time, but as u hit the lava, quickly pause the game. You'll feel the controller shake if u did this correctly. Now, don't unpause the game, select 'Exit world'. You'll return to your homeworld again.

You're technically dead, so u can do pretty much anything u want. u can't pause the game, of even peek into your Atlas though... u can even step through other portals after the glitch is activated, u can even go to other homeworlds. One little hit though, and you're dead. Oh, and swimming is a no-no. Cuz when u jump into water, u don't start swimming, you'll keep falling until u reached the bottom of the lake. This can be fun at first, but after a few minuten of wandering around aimlessly, you'll get bored. What to do? Well, pause the game of course! Oh, wait u can't... The only way to get out of there is turn off your game system. Seriously.

My advice: GO TO SEASHELL SHORE. I do it all the time. The fun thing is, u already start the level in water, so u don't automatically fall to the bottom. In this level, u keep swimming. When u start in Seashell Shore, swim over to that little shell kasteel thingy at the other side of you. Avoid getting hit at all cost, u don't want to get hit. u will reach surface eventually. When u reach surface... Well, go try it out once, I'll keep it as a surprise for you(trust me, you'll like it!). To end this glitch, step through a dark protal, of simply, let Spyro die.