Power of suggestion. That's what your subconscious mind wanted to you to see. I had seen the same thing. Maybe it's also about probability. Odds are that on this site, you are more likely to actually see "Dick Butts". Even though it makes about as much sense as a Peking Duck on a hotdog bun.

With "Duck Butts"..Now you're talking. I must check now for the existence of /r/duckbutts/.

Now why don't you folks at home give it a go..

Even though it makes about as much sense as a _____________________.