WhaT is THe MoSt embaRRaSiNg thinG that has haPPened

I'm meeting someone on a date. I'm dressed up with jeans and blue polo t-shirt. Before arriving in to the mall i enter in to the comport room to check my image. I'm satisfied with my appearance. Then i enter in to one of the cubicles and do my thing. After that i look for my date in one of the pizza parlor. I found her beautiful as ever in the far corner. I hurriedly come closer. She had the brightest smile on her face upon seeing me. But she keep on glancing at the front of my jeans, with a weird smile. Then she sat beside me and whispered in my ears,the zipper of your pants is open. That was the worst embarrassing moment in my life.