Impossible. Perhaps u saw a video on youtube. if u got GTA San Andreas for PC u can download files called Modifications simply "mods" once u installed a mod, you can do everything that actually...
This would probably have to be a mod. Suggest you look at gtawiki for their comprehensive section on modifications and also cheats:gta.wikia.com
Of the people, of the people, of the people. -or simply-People, people, people.
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