One of the best ones was in Spyro 3, there's this level where you have to escort a wolf trough the level. Magically, at first, I got it stuck on the floor. I ran around for a while, confuzzled, and when I come back, the wolf is running around the level non stop. (The level is circular) That glitch occurred a few years ago...and I have a feeling the poor wolf is still running.
Other one in Spyro 3 is that you can pretty much swim in air anywhere. :P
And the last one in Spyro 3 yet again is that in one level, I was just swimming around the air for funzies, when I discovered something unusual I never had seen before. Behind one wall in the level (you weren't supposed to go there, and it's inaccessible without the swimming glitch) was a random portal to a bonus level. I swam towards it, and I ended up in a round, small level, which looked like a rodeo arena. It had absolutely nothing in it. I jumped around for a few moments, then I jumped in the middle of the "level", and it teleported me back to where I came from. The swimming glitch had ended when I entered the glitch level, so when I got out of there, I fell into nothing, ending up in me teleporting back to where I had last saved, with one less life.
Also, I appear to have the magical skill of changing any game's language settings without even touching the settings once. This occurs on phones and TV too.