CAUTION: To friends using the PIC16F88

Just a short cautionary note to all friends using the Microchip PIC16F88 chip.

If you use Internal Oscillator as your system clock, please avoid using the MCLR pin as input, eventhough PIC16F88 can be configured that way. The reason for this caution is that, once your program the PIC, it is almost imposibble to re-program it. The PIC will start executing once it's powered and that will some how cause the programming timing to go haywire.

Do take note.
I've wasted two PIC16F88 before looking this problem up on the 'net :-(