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.
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