Breathing. Eventually you fail entirely.
Mixing cocktails. The more I practice, the harder it gets.
*burp*
Getting married. The more times people have been married, the less likely they are to have a good marriage.
Aren’t you comparing getting married to being married here? I guess if you got married 11 times, you should be quite good in the process of getting married like knowing all the procedures, organizing everything, finding the right words etc.
You might even get a special rebate as you probably know the staff of the involved companies better than your spouses at this rate.
Being young
Hearing. Hearing damage does not ever get better, it just accumulates.
Signing my name. If you’ve ever had to sign on a mortgage, oh my God they start out looking like words and end up looking like scribbles.
My realtor told us on the first day "just scribble in the rough shape of your name, you’ve gotta do 500 signatures may as well be consistent "
My wife and I were gonna order stamps to do it but that’s not allowed.
Being alive.
Babies are pretty bad at staying alive. My 2 year old cousin will actively run full speed towards traffic.
I’m twisting the question a bit but people who are extremely good in their own field are more often than not very bad at explaining concepts related to it to laymen and they get worse the more they know.