I had a couple of days off last week and returned to even more emails than usual and most of them were dross, could have gone to the colleagues I listed in my OOO message, or could have just waited till I got back. I often wonder why I bother with an out of office message when every idiot going just emails anyway.
It was different back when you didn't get an out of office message till after you'd sent the email, but these days our version of Outlook shows you the person's OOO before you send the email so there's no excuse.
Seriously tempted to make my next OOO say something along the lines of:
"I'm currently out the office, so don't bleeping send me any emails. I'm back on Xday - if it's still an issue by then, let me know. Remember: no bleeping emails!"
Just to check if anyone actually reads them.
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Also, I've got a colleague who constantly promises to do things and never does. They're not massive things, so it's not a major issue, but don't promise even small things if you can't be arsed or are just going to keep forgetting.