GTA San Andreas - Hit people with guns

This glitch is quite useless to be honest, but it's kind of neat:

To do this you will need at least a melee weapon (like a baseball bat) and a gun.
Switch to the bat or whatever your using, swing it, then quickly switch to the gun or other weapon. If done correctly you will swing the other weapon like the melee weapon.

GTA San andreas - Flying in Circles

To do this trick, first go to the crane(that you use for exporting and importing vehicles) and attatch it to your car ( any car should do i think )

Then do the flying car cheat (Up, Down, L1, R1, L1, Right, Left, L1, Left)

Now try to drive as fast as you can away from the crane, if done correctly your car will go a little ways into the air, and then you should be able to start flying around in circles (it could take a little bit of adjusting to the crane so that you won't hit anything)

GTA San Andreas - Get into locked cars

To get into locked cars, (such as the one outside of your girlfriends houses before you unlock them) simple push them (or pull them with a tow truck) to a house that has a garage let the door close with the car in it and go back in and you should be able to get into the car.

Fall several thousand feet into water on the Liberty City Mission on GTA San andreas

this trick will let you partially explore Liberty City until you fall into oblivion

On the mission where you go to liberty city, continue the level until you reach the outside area where the main guy you've gotta kill is kill his friends but leave him alive (so you don't pass the mission)

Now do the High Jumps Cheat( Up, Up, Triangle, Triangle, Up, Up, Left, Right, Square, R2, R2)

now there are probably a number of places to do this so just jump around until you find a ledge or building you can climb over, now walk around at your own risk.
Some buildings and things are solid but the streets are not so if you walk onto them you will fall what seems like several hundred feet into a pool of water
(note that there isn't any escape besides loading or using the suicide cheats)

GTA San Andreas Get through solid objects

this is a neat little glitch that can get you through buildings, mountains, etc

so here is what you need to do:

first of all this requires a cheat code(spawn hydra)
if my memory is correct for ps2 you press:

Triangle, Triangle, Square, Circle, x ,L1, L1, down, up

Now this next part is a little more challenging you must get at the right angle at the building
so that when you spawn the hydra it will be partially inside of the building with the cockpit side out, and far enough that you can get in (this may take practice) if you've done this right, get into the hydra and quickly get back out, you should be inside of the building, or mountain