I know that this is like some kind of transference or something, but when I say 'I love you' to my cat she often meows back in a similar vocal pattern to what I make when I tell her that I love her.
I can't help but think she's saying 'I love you'. I mean, logically I know she isn't, but my heart says 'OMG THIS CUTE KITTY LOVES ME~ <3 <3 <3"
It is important to note that my kitty does absolutely love me.