Um, pretty much everything falls in this category for me.
Any animal, for one thing. I'm constantly speculating 'what if an Animorph morphed one of my cats?' And of course, any hawk I see immediately makes me think of Tobias.
Let's see, what else . . .
Mm-bop, Stuckey's, oatmeal, Area 51, UFOs, California, The Gap, Trafalgar, Star Trek, McDonalds, Goodwill, zoos, Red Baron, and, of course, anybody named Jake, Rachel, Tobias, Cassie, Marco, David, or Philip.