My Panty Raid T-Shirt Made My Grandfather Upset

Now, I live with my grandfather. I do a lot with him. He's been by my side all my life. I've gotten in trouble before do to misunderstandings with girls, so I usually avoid them like the plague. The other night I saw the Spongebob "Panty Raid scene" and I thought "Man, my guy friends will get a laugh out of this!". But the only Panty Raid t-shirt is from Revenge of the Nerds I thought cautiously over it and I came to the conclusion I wouldn't wear it in public so I wouldn't be labeled as a pervert. So I ordered the shirt with the intent of wearing it around the house. I got it a few days ago and last night I wore it. My grandfather never noticed it. Today, there was commotion in my street and my grandfather left without warning. I wanted to see what was going on, but it was the only shirt I had that matched my pants. So I went outside and didn't seen him. I went up the street and two kids on scooters past by and a car. Other than that, no one saw me. I walked back as soon as my g-pop came home. He had a fit. He told me I would be arrested if a child-grabbing crime took place and people don't like the movie. He also said I'd be labeled a deviant and a guy would get out of his car and punch me. He threatened to call a psychiatrist and have me thrown in a psyche ward. I explained I only was outside for a few minutes and I never intended to go outside in it, but he said I just wanted to prance up and down the street to make a scene. I then explained it's from a popular movie; a well-known movie and people would get the reference. But he retorted that most people now-a-days never saw the movie and would instantly label me a creep. This is the t-shirt: https://www.google.com/search?q=panty+raid.tshirt&biw=1708&bih=816&source=lnms&tbm=isch&sa=X&sqi=2&ved=0CAYQ_AUoAWoVChMI7sOjqtqLxwIVgloeCh0iSg90&dpr=0.8#imgrc=Uw-jgMFx4TbRyM%3A Should I have bought it? Because now my G-Pop thinks I'm going to rape someone.

You're either trying to hard or not enough. It's like you just gave up on making your stories even remotely funny. Surely you can come up with better than this. I'm only commenting as someone who cares about the art form known as comedy...It truly is dead here.

I'm not trying to be funny, I'm dead serious. I bought a Panty Raid tshirt and my gpop got all crazy I need advice