Putting someone on the couch and other expressions...

[Sylphidae]

Here I am again. Got these phrases from the movie “I, Robot”. Please let me know their meanings.

1.) Spooner: You’re putting me on the couch?

2.) Dr. Calvin: Humoring you for no reason, why?

• ‘humoring’ here cannot be directly translated as
  ‘joking’, is it?

3.) Sonny: I see you remain suspicious of me.
Spooner: You know what they say about the old dogs.

• What is Spooner trying to tell about? What is in the
  ‘old dogs’ that makes the phrase relevent to the whole
  sentence?

[Alan]

Put on the couch is psycho analyse. Humour someone means let them do what they want because you like them and old dogs I imagine means people who have been around a long time and are therefore wise and experienced.