Pete Davidson recalled a painfully awkward childhood memory where his grandfather once caught him watching a gay porn video. As seen in a video clip obtained by TMZ , the 32-year-old comedian shared the story during a recent stand-up set and explained that he accidentally clicked on a graphic gay adult video when he was 8 years old and kept watching out of curiosity. He said the “Lemon Party” clip featured “six 70-year-old men” set to the whistling theme song from The Andy Griffith Show . “I clicked it and it was horrible. It's a video of six 70-year-old men, white guys, blowing each other to the Andy Griffith theme song,” Davidson said before whistling the infamous theme song. “I watched the whole thing cuz I was eight, and I was like, ‘What happens?’” Things quickly went south when Davidson heard his grandfather coming downstairs after a Knights of Columbus outing. He shut the computer screen off, but his grandfather demanded he turn it back on.…