Do any of you have good undergrad comeback stories?

Short answer: it depends if any program, scholarship, or anything has a GPA requirement.

Long answer: Of course there is. One bad semester is just one bad semester. Few companies look at grades/scores except for the first job, and if you have an answer as to what went wrong, most understand. I remember people in my program who were in their 5th and 6th year of work for a BA (full time). Some had a hard time adjusting to college life and needed a "redo" year. Didn't harm them in the long run.

my buddy in medical school said he and his peeps used to say:

  C = MD

like this:

https://gruntdoc.com/2008/12/cmd.html

T-5 ?