Here are a few of them...
I don't understand why the commercials are so much louder than the television shows they interrupt.
I don't understand why the volume button on my remote is dying; making it frusteratingly hard to turn the volume down quickly when the commercials try to pierce my eardrums.
I don't understand people who bring other people into situations that are not their concern. I do not want to be in the middle of your drama. Why do you want to put me there?
I don't understand why we are still observing time change in 2013. We should just stop that nonsense.
I don't understand people who refuse to tell the truth.
I don't understand how someone can chose one child over another.
I don't understand people who knock loudly on the door at 3am, and wake up the neighbors. Especially when I am the neighbor who is trying to sleep. I also don't understand people who knock loudly on the door at 3:30 am, and wake up the neighbors. There is no greater understanding when it happens at 4am, either. Unfortunately, I do understand why no one in my family got enough sleep last night.
I don't understand why blue cheese is so tasty on a salad, but blue cheese dressing is awful.