I read somewhere recently that when a cat head-bonks you (pressing the top of his/her furry little head against you), it's a sign of love and affection and true loyalty.
So, yesterday, when my little fluffy kitty head-bonked my leg, it made me feel all happy inside. I scratched her behind her kitty ears and told her that I loved her too.
And then she walked over and head-bonked the toilet. :)