[Basicz]

I usually did this to fix Unreachable Code ( AFAIK )

Code:

public OnPlayerEnterVehicle(playerid, vehicleid, ispassenger)
{
    if ( vehicleid == 520 ) // Just a random ID, unsure if it really exists
    {
        SendClientMessage( playerid, -1, "You have entered vehicle ID 520." );
        return 1;
    }

    else if ( vehicleid != 520 ) 
        return 0;

    return 1;
}

Dunno, but as far as I remember I did that to fix Unreachable Code :P

Great list but,

Variable basicz shadows at a preceding level ( something like this ), please add it.