Non-Compulsory Reasons for Ramp Turn Back

[titaniumwings]

Notwithstanding the guided and compulsory reasons (eg MEL, dispatch, bomb threat, unruly passenger), what other reasons would you return to the gate?

This question seems fairly easy to answer if it is in the air but would the totally same approach be taken for the ground return? Is there any guide to be shared?

A few examples would be travelling documents, medicine, a passenger received call of a family member's accident and imminent demise (distraught but not unruly) -(just before the silent phone check). Would you return to the gate?

Thanks for sharing.