I call it 'gas leak', because a gas leak in my town caused an explosion that leveled the house. That would have destroyed all my paperwork that proves who I am. If I'd come home from work and said 'buy that's my house', how would I prove it knowing my key no longer fits the smoldering lock?
If I'd left my wallet at home, my bank cards would have been destroyed so I couldn't withdraw money or book into a hotel. Or if I'd left my phone at the office I wouldn't know anyone's number to call, or get anyone to vouch for me.
What preventative steps can you take?
(Since having this nightmare, I've exported my phones VCF file to an online repo, make online notes of all my bank account numbers and passport ID, keep ICE numbers with me at all times (separate from phone/wallet), and hidden a spare mobile phone and house key in a box in a nearby field, but there must be more to do!)"