When you have to pull the pen over to the left side, the cord always gets in the way of what you're trying to write. It's weird to reach around with the left hand and zip up from the other side. Die-hard lefty bakers might want to invest in a left-handed version of the classic cup.The rings make it impossible for left-handed people to lay their hands flat on the page and write normally. The best solution is usually to wedge the left hand between the top two rings when writing on the top half of the page, then wedge it between the bottom two rings when writing on the bottom half.Spoiler alert: It is not comfortable. Reaching over and swiping the card downward in your left hand feels weird. Of course, switching it to the right hand usually feels even weirder. If you use your left hand, you have to reach across and sign at an awkward angle as the attached string gets in the way. If you use your right hand, your signature is illegible.This is hard to picture, so here's a video that shows what happens when a lefty uses a right-handed can opener. Good thing there's no shortage of leftie versions online. In a classroom like these, lefties don't get the luxury of resting their elbows on anything. Would you want to drink piping hot coffee with your non-dominant hand?Lefties plagued by this design can purchase left-handed keyboards with the number pad on the left.Yeah, not comfortable. Source: Los Angeles TimesVegetable peelers only have one sharp side. They're designed so that when they're held in the right hand, the sharp side is on top and users can comfortably pull the tool toward themselves in a smooth, gentle motion, as seen in the photo above. But when the peeler is held in the left hand, the sharp side of the blade is on the bottom. This means lefties have to push the peeler away from themselves, resulting in short, jerky, uncomfortable peeling motions.Luckily, lefties can purchase left-handed peelers that solve the problem.The natural way to open a door is to reach across your body to grab the knob, and the default is usually to have the knob on the left-hand side. That means they're often built for righties to reach across their bodies with their dominant hand. Now, imagine reaching for a knob on the left side of the door with your left hand and pulling. Basically, you end up with the door in your face.There's a bright side, though, because lefties get the advantage when they go through that same doorway from the other direction. On the other side of the door, the knob will be on the right, so it's meant to be grabbed with the left. Even capturing moments is tougher for left-handed people. On left-handed rulers, the numbers move from right to left instead. That way, lefties can drag their pens from right to left and get a clear look at the numbers.There's a left-handed tape measure you can buy to fix this problem, too.