Forgotten identification

I've now been attending college for a month and a half. I always ensure that I take to college everything that I need, be it relevant course papers, stationery or my student identity card. Today, for the first time ever, I forgot my card.

I realised after I arrived at the college that I hadn't brought my card with me. Fortunately, I had recently taken a photo of my card, which is stored on my phone, in case I accidentally forget it and am asked why I don't have it on me. I was annoyed but since I had the photo, I thought I'd be okay.

Later, in the classroom, we were told that we might have to go down to the library to use the computers. At that point, I groaned: in order to use the computers, you need to physically have your card with you. The reason that we were to use the computers was because our math(s) teacher was out sick and wouldn't be present. The assistant was doing his best to substitute for the teacher

Fortunately, an hour into the lesson, the teacher arrived. Apparently, there had been a breakdown in communication and he had only taken the morning off but was capable of working in the afternoon. The lesson then proceeded as normal.

This is the first time that I have forgotten my student identification card and I hope it'll be the last. It's not a habit that I want to develop!