Not packing the tent poles on our hiking/camping trip to the Red River Gorge in KY, many years ago. Here we were, a good 2 hours' hike away from the parking lot, waaaay uphill at the peak, where we chose to camp. Oops. And oh my gosh, did it ever rain that night. We tried to rig that tent up with branches, hair ties, shoelaces and prayers and it was quite a sight!
But I don't hold it against him. Though we passed the night in soggy cold misery, it was a sort of bonding experience, something we'll never forget, something to talk about for years. See? It's been about 14 years now, and I still remember.
But hey, I've done TONS of dopey things too. I don't think my hubby could every nail down the dopiest for a post like this. Too many to choose from.