So

I was strolling along a few minutes ago when I saw a young woman with two heads and thought, "Huh, that girl has two heads." After a brief pause I thought, "Wait, that girl has two heads!??" Then I looked again and it turned out to be two girls walking together.

The interesting thing is that there was a brief time when I thought there was a two-headed girl walking by and I had no problem whatsoever with that fact.