<human>: Can you provide a brief overview of the text?

Strap yourselves in boys and girls, we're about to go on an adventure. As I walk through the aisles of Wally World, trying to locate certain items of interest, I find them neatly nestled on the bottom shelf next to an elderly lady with a walker. Excusing myself for getting all up in her personal space to get my tasty treats, I hunker down to examine prices and flavors. She starts up a friendly convo, as old ladies do, and I oblige her with small talk half heartedly, as I am on a mission. A few moments later she turns to sneeze. And this isn't a normal 'achoo' sneeze. It had enough gusto that she could have shot a monkey out of tree with a blow gun at 200 yds. Looked like she would have blown herself off her feet had she not braced herself. As this happens a long thick snot rocket finishes take off procedures and attempts to make orbit. Unfortunately, like the north Korean missile program, it just didn't quite make it, and fell back down on her face. However, it gets worse. Worse you say!? How so? Well I'll tell you how!! While the space program was making international news, somewhere, brewing off the grid, Project Dirty Bird received it's orders to fire at the exact same time. The skys grew dark and the air raid siren sounded, but it was too late. As my eyes started to tear up and my lungs started to melt, I notice that she had evacuated her bowels. FORCEFULLY!! IN MY FACE!!!!! Now I don't know what all escaped, but I can tell you it tasted like old milk and shame. Being the nice guy I am I tried not to bring to much attention to it, but, she knew that I knew. Her eyes widened in horror as mine shriveled in agony. We stared at each other for a silent few seconds before she turned tail and shuffled down the aisle into the distance. Never to be seen again. To this day, it's said that if all is still, you can hear the faint scraping of a walker as it scurries across the linoleum.
<bot>: Bent over to get snacks behind an elderly lady who proceeded to get snot on her face and let her bowels loose in my face.