“That R2D2 dude is actually kind of a dick.”
Or maybe it’s a Mogwai (from that movie Gremlins), in which case he’s probably wondering if it’s past his snack time yet.
Oooh, or maybe it’s a Moblin, and he’s wondering why he NEVER runs out of spears to throw at that dumb little elf kid dressed in green!
Regardless, they’re probably ALL wondering why BART is so goddamn late.