Semi-lighthearted...
First moronic occurrence: Received an email yesterday copied to four people, so six people in the conversation altogether. Let's call them Alice, Ben, Charlotte, Dan, Emily, plus me.
So Ben had written to ask me to say in advance whether I need a particular item on a particular day. This item is provided by Dan. If I do need said item I should email Ben, copying in Alice, Charlotte and Emily. But not Dan. So basically now everyone is now in the loop apart from the one person who actually provides the item.
Second moronic occurrence: I emailed someone (not Alice, Ben, Charlotte, Dan, or Emily, as it happens!) requesting to book a room for a specified date in July. This person said she would check whether it was free. She then proceeded to write to all the other clients who make bookings for this room to ask whether they are using it on X date - which is an entire fortnight before I actually need it.
Third moronic occurrence: I wrote to ask for a refund for a train ticket, explaining that, owing to delays, I had had to purchase a new ticket and catch the following service on that route (a four-hour journey) half an hour later. I was asked whether I had used both tickets.
Please make me feel better with other tales of people's idiocy.