Making a list of pros and cons is an exercise that Liz Lemon tries to consider whether or not to break up with Dennis. It was seen in the episode The Break-Up.
The fact that Jack Donaghy likes Dennis was added to the list twice, once as a pro and once as a con. Liz finally completed the list- with the cons as the winning category- when she sees Dennis on TV trying to have sex with an underage girl.
The list
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Pros
basically nice
takes good care of his feet
makes good chili
remembers my birthday
rarely wants to do it
is funny when he goofs on his friends
doesn't care about money
loyal
too lazy to cheat
would increase likelihood of blue-eyed kid
loves The Simpsons
has good hair
has already seen me throw up two times
fixed TV
Jack likes him
Cons
not super smart
listens to Winger
dental hygiene
wears acid wash denim
always wants foot rubs
not much money
Catholic
doesn't like his mother
his mother doesn't like me
i don't like his mother
loves Family Guy
reads The Post
insists on spending holidays with his mother
has already seen me throw up
attempted three way
racist
wears Italian even though irish
Jack likes him
Attempted sex with minor
