My wife and I often swap driving duties in the driveway, shuttling one kid home and another one out to an activity, sometimes without turning the car off.
You can imagine how this works with smartkeys...
Thankfully she only drove about 5 miles (with a very subtle message "no key" on the dash, no audible warning Because Honda), shut it down, then thought the battery was dead.
So I show up 20 minutes later with a jump box only to see that it's showing ~14V on the battery.
It was sooooo stupid because using most traditional diagnoses (and being new to smart keys), it's actually hard to figure out unless it happens to you.
Drove back home, got the key, then drove back again to get her. Fun times.