Almost always the problems we have to solve are the problems we have to solve. I have personally never not had to solve a problem I had to solve, nor had to solve a problem I didn't have to solve. Furthermore, the times I didn't know how to solve a problem I had to solve I had to solve, I had to also solve the problem of finding out how to solve the problem I had to solve which, to top it all off, I had to solve!
It was quite aggravating.