As it happens, this bug was somewhat in the original version of GTA. Whilst walking over water would kill you, if you tapped the jump button, you'd never fall.

As it happens, this bug was somewhat in the original version of GTA. Whilst walking over water would kill you, if you tapped the jump button, you'd never fall. This could allow you to reach areas otherwise impossible to reach - just find a high enough building, run off the edge and tap jump until you reach your desired location!