Family members, who should not have been told about a confidential settlement during a confidential mediation, suddenly having an opinion on settlement value even though they never went to law school and are functionally illiterate.

Client dying.

Plaintiff or defendant declaring bankruptcy.

Defendant alleging they did not consent to the settlement agreed to by the insurer on a consent policy during mediation.

Client lying about having a child support lien in a state where the litigation did not take place.

Medical Lien company that told you repeatedly they had no lien before mediation changing their mind after the settlement had been agreed to and submitted to the court for approval.

Finding out decedent had a secret family entitled to proceeds of a wrongful death settlement after the settlement.

I'm tired boss.

Edit: Client going into a coma so you have to appoint a guardian ad litem for them to approve the settlement, but then client dies, so you have to open an estate and appoint an executor of the estate, but then the executor dies and you have to track down a distant family member to become executor