As I've written about many times, Max loves getting head pets. Always on her terms.
If I'm sitting at or standing near the table, she'll fly over and gently nudge me with her beak (as seen in this video.) Then, once she has my attention, she'll start scratching her own head, in order to communicate to me exactly what she's hoping to get from me.
This time, she decided not to scratch her head, but she was still so adorable (I might be a bit biased...) that I'm posting it anyway!