Yup, or there's no pull-up/down resistor. whatever
Code:
        '-------------------------------------------------------------------------------------------
        '
        '       The following have been tested, no problem at all
        '       
        '       Hardware description
        '           1) LEDs connected betwee PIC I/O and GND via resistor
        '           2) Push button between PIC and GND... nothing else.
        ' 
        '-------------------------------------------------------------------------------------------  
         
@       __config _WDT_OFF & _MCLRE_OFF & _CP_OFF
                ' Disable watch dog timer
                ' Disable MLCR, GP3 as I/O
                ' Disable Code Protection 
                              
        Red         var GPIO.0
        Green       var GPIO.1
        Blue        var GPIO.2
        SwitchPin   var GPIO.3  ' Active low
       
        OPTION_REG = %00000000
                   ' -0-------- _GPWU -- Disable Wake-Up on pin change
                   ' --0------- _GFPPU - Enable Weak Pull-Ups 
                   ' ---0------ T0CS --- Timer0 Clock Source Internal (O T0CKI pin, 0 Internal)
                   ' ----xxxxx- Timer0 related stuff... don't care
        
        TRISIO = 0          ' Clear all I/Os
        GPIO = %00001000    ' GP3: Input, other pin: Output 
               
        ButtonCount VAR BYTE

MAIN:
        IF !SwitchPin THEN                              ' Switch down?
                                                        ' - YES
                If ButtonCount = 3 THEN ButtonCount = 0 ' - Currently on GP3 (MCLR)?  If so, pass go, claim 200$ 
                pwm ButtonCount,127,100                 ' - Light Show
                WHILE !SwitchPin : wend                 ' - Spin 'till button is released
                pAUSE 50                                ' - arbitrary debouince delay
                ButtonCount = ButtonCount + 1           ' - Point to next LED
                endif                                   ' 
        GOTO MAIN