Transfender glitch

[Slayer]

I've found this glitch a few days ago. get a sanchez and get into transfender shop in san fierro. when you exit, you will appear somewhere "in" the transfender's roof. then simply smash the gas and you will fall through the endless hole (something like the hidden pay 'n' spray glitch) but if you go too slow, you will fall onto the underworld train tracks. after a couple of seconds, you will spawn somewhere nearby the transfender.