Five ups and downs of research: no particular order!

UPS
1) Finding the information that gave me the breakthrough on the fate of Captain Zachariah Rhodes at the NEHGS Library.
2) Seeing the court case that confirmed Cornelius Prall Sr. was the son of Aaron Prall.
3) Finding the letter written by Dolly Jennison Simmons to her sister [1860] in the Jennison Family History that confirmed that [James] Morris Simmons was her son.
4) Stumbling across a new genealogical find on any family.
5) Assisting others in locating info.

DOWNS
1) All of the misinformation accumulated in online family trees.
2) Discovering that I assigned the wrong person to a family. [Correcting that error is an UP!]
3) Finding the ages of the children in an ancestor's probate - the minor children, not the children over the age of majority, of which my ancestor's daughter is one.
4) Finding "unknown" listed for a parent on a death certificate.
5) People who won't let go of family data that has been proven to be incorrect.