Why might someone make out with his reflection on the metro?

I’m just curious if there is any explanation for this

From the same site:

Bolding mine. Says it all. There doesn’t have to be a rational explanation for everything.

Well, A-Rod did it …

http://www.google.com/images?hl=en&rlz=&q=alex+rodriguez+kissing+himself&um=1&resnum=2&ie=UTF-8&source=univ&ei=ClMjTYe9FsP98AbJ3MXXDQ&sa=X&oi=image_result_group&ct=title&resnum=2&ved=0CCoQsAQwAQ&biw=1600&bih=688