Glitching when outputing or inputing on any ports

[z3roco01]

I'm using a mega2560 and I'm trying to take any input(digital and analog) or output anything but it glitches the video this is what it looks like:

[z3roco01]

it happens when i use pinMode() too

[joveaaron]

I expect this to happen because the MCU has to use some cycles to swap the pin mode and write or read to/from a port.