<human>: Could you distill the essence of the text into 1-3 sentences?

More like, during the weekend  I fucked up.

I was heading to the "Zombie Walk"  with my friends, which is a gathering of people dressed like zombies with games, food, etc. While on campus I saw a guy with wispy white hair, sunken in eyes, wearing all black. He was walking slowly and crookedly, with his head drifting to the side, both arms bent, shuffling along. Best zombie walk I have ever seen! 

I enthusiastically yelled "YEAAAAAHHH!!!!!" loudly, cheering him for his dedication for being in character as a zombie the whole day. 

Instantly, my friends and about 10 other strangers stared at me  as if I was convicted for drowning puppies. 

Confused, I said, "What? He's a ZOMBIE!" very happily and smiling. I was thoroughly convinced he was acting as a zombie, and was on his way to the festivities!

 As we walked, I saw him closer and realized he was an elderly man, with some sort of handicap making it hard for him to walk. Realizing this, I felt absolutely awful and hung my head down in shame, as my frienda slowly inched themselves away from me. Spent the rest of the walk realizing how I am definitely going to hell.
<bot>: Yelled "YEAH!!!" at an elderly handicapped man on the way to the zombiewalk, thinking he was a zombie on campus. Now I'm going to hell.