I heard spitting at commercials was also a strength of his.
I got to admit, and don't slag me cuz of this, but i really don't have no love for Jeffries anymore. I think Byrne wrote him great. I think his inclusion in the team after Byrne left, was a big mistake. (And one i plan on fixing; in my world [ http://my-af-writer-jb-then-me.blogspot.ca/ - coming soon] Jeffries will be hanging with X-Men, not Alpha Flight.)
For me, I am changing my "ad hoc" for Jeffries to "ad nauseum".