PSYCH! Shawn and Gus are such complete BFFs that it almost only makes sense for their BFF-ness to include all aspects of their lives.

I think one of the reasons SGA S5 hits a particularly sour note for me is because I started really watching in mid-S3. I only remember the barest outlines of most of S1 and S2, which I only watched because I'm a canon completest and can't jump in mid-stream. S5 has had moments, but mostly...I'm just not loving it.