I wouldn't touch that with a 20-foot pole
A phrase used to say that you strongly wish to stay out of the way of an argument/heavy situation and not have any involvement.
Employee: I caught Debra and Jeff having sex in the office, what the hell are they thinking?
Boss: Err, I wouldn't touch that with a 20-foot pole.
Boss: Err, I wouldn't touch that with a 20-foot pole.