i was playing guitar when i wanted to listen to a song, so i did with guitar still in lap
and obviously my mind thinkgs "i like this song i would want to play it, but i wouldn't know where to start. if i had like the first note i could maybe work with that"
and then i start mindlessly picking random notes and like the third note i try is the first note in the song ;}

i only figured out the first couple of notes, it is recognizeable at least, then i needed to do other things

@Marmalade
Nice. That's what i usually do on piano.