I'll refrain from an A to Z and just do some As
Anxiety
Autism
Acquired brain injury
Guests with yellow bands should not be admitted through the main queue of rides, however after working as a ride host, I know they sometimes queue in main queues to try and surpass the need to go on with a carer (For example if their carer does not want to go on a ride), alternatively to 'skip' the virtual queue they wait in after a ride
Edit: Again, be careful, saying 'Waving around your yellow little band' could be taken offensively by some, as some disorders lead to involuntary movements