Yep, I keep my ignition key separate from other keyring stuff.
Rode off from the house to fill the bike with petrol. As the bike self armed at the pump, I started wondering where my immobiliser fob went. Yep, I left my house keys with fob hanging from the front door lock.
Luckily this was in a sleepy Fenland town and there were still there after my half mile run in bike gear.