My dad bought me a new water bottle off of Amazon. I drink a lot of water at work, and this particular bottle was rated close to 5 stars because it keeps drinks hot for 4 hours or cold for 12, it has an "autoseal" button that you push to open the valve to drink, making it leak-proof once the button is closed.
It's great. It really does keep drinks hot or cold. When the button is closed, it really doesn't leak, so I can throw it in my bag and know it won't get everything wet. But when I pushed the button to drink, water would leak all over me and I had to be very careful with it. It was so frustrating, I though, "Um, how did this get 5 stars, it's leaking when I drink it!" Not only that, but not much water came out. It seemed...inconvenient.
Yesterday, I showed my dad this. He has the same bottle, so I figured he could tell why it was leaking and not getting much out. I took a drink from it to show him, and he just started laughing. He said, "Well, it helps when you drink from the right side and from the right opening." I looked at it, tried drinking from the right side, and it all made sense. I looked at it and said, "...oh." He had to lean against the wall he was laughing so hard.
Then, later that day, he came into the living room with an upside down cup, acting like he was drinking from it, and he said, "Rachel, can you help me figure out this cup? It's just not working." Ha. I love my dad.
So, yeah...sometimes I'm not the brightest.