Today, I woke up and struggled to find the motivation to ride to work in 34F and heavy fog. I made myself do it only to find my rear tire was low upon leaving my driveway. "A HA!" I said when I noted the presta valve was open. Surely that was the cause. I pumped it up and went on my merry way (sans eyewear, D'oh!). 3/4 of the way there my rear tire was flat again. Ok, slow leak. I'll use my trusty Silca CO2 inflator to give it a pump just to get to work, I'll change the tube when I get there. That would've be great if I had remembered how to actually use the thing; one CO2 cartridge down, no biggie. Welp, may as well change the tube now. I get to work at least a half hour later than I intended with a dead headlight because I'm an idiot. They can't all be great I guess.