Partial list of nightmares

In case some of you have lost track, this is a partial list of nightmares I have had over the years:

1. Receiving null results on a research study.
2. Neglectting to attend an English class for the entire term in college.
3. Having to maximize some likelihood in a multivariate statistics course in the Ph.D. program.
4. Neglecting to turn in my assignments for the whole term in my Ph.D. program course in econometrics.

I will revise this post and add items as they come to memory.