It's not impossible and not unusual to have misplaced or confused the two.

Got up this morning and could not find my glasses. Finally had to seek assistance. Kate [Winslet] found them inside a flower arrangement.

Anybody who works in a convenience store or works unusual hours should be aware of what or who is around them. If something doesn't look right, it probably isn't right,

It's conceivable that the D.A. could find that there is not enough evidence. It would be unusual, but this is an unusual case.

It's not so unusual to run out of someone else's currency.

This is not common at all. This is a very unusual occurrence for us.