I've made a few excuses and took a few chances in order to go birding, but I'm not sure how many you could describe as irresponsible.
I've phoned in work sick occasionally in order to go birding and not told the wife - fingers crossed she doesn't phone me in work :eek!: Thank goodness for mobile phones these days! I guess that's irresponsible if either the boss / wife finds out. I ticked off Black Brant and Red-footed Falcon that way.
I also went birding on my way to the hospital to see my youngest lad born. Sounds bad perhaps, but it was a cesarean and I had a specific time to be there, so I don't think it was exactly irresponsible.
One Saturday afternoon in 1994, I took my 4 month old son to see Rose-coloured Starling at Moelfre on Anglesey. My wife thought we were going to Martin Mere. Just past Conwy, the car broke down in a big traffic jam. The AA came out, "fixed" it, but just past Menai Bridge it went again. Rather than phone the AA immediately, I managed to limp the car to Moelfre by making sure that I never stopped, i.e. I had to keep it moving at every junction. Once at Moelfre I phoned the AA, and whilst we waited for them, took my son for a walk in his pram and ticked the RCS. We got back to the car just as the AA turned up, and were home for 8pm. Wife non the wiser, although she was slightly suspicious about why we were so late back from Martin Mere!
I guess the worst thing I've done though, and something which still haunts me to this day was at Stag Rocks at Bamburgh. We were staying in the area on a family holiday. My eldest lad was about 6 months old at the time, and I took him out by myself in one of those rucksack type baby carrying things (i.e. he was on my back). It was March, and I was watching some Purple Sandpipers on the edge of the rocks. I tried to get a bit closer, by walking on the rocks, and I slipped. I was right on the edge of the sea and only by some miracle did I manage to stop both of us going in. It was cold and there was quite a swell, and I really don't know how I would have got out, especially with a 6 month old baby on my back. That was really irresponsible.