My closest miss was my very first foray into punting - nearly blew it before I even started...
Was working from home one day, OH was downstairs (also off) and I had researched some birds in the city I was working at the time. Got the horn and was very nervously talking to the WG on the phone, talking very quietly, must have seemed really nervous, when I heard a creak and opened the bedroom door. OH was just on her way into the room to tell me something. I remember the last thing I said to the WG was something like "I've never done anything like this before..." and then OH popped in.
I mumbled down the phone something like "wait, hold on, someone else is interrupting, and covered the phone and looked at OH, waiting for her to speak. She had a really weird look on her face and said something about telling me later and walked downstairs. I fumbled the end of the convo with the WG and popped downstairs where OH was on the sofa - she said "what was that?" (or something like that) and I apologised for being blunt and said I was talking to a technical team (I worked in IT at the time) and was discussing a new method of deployment we hadn't used before. That was the last that was said, and while her nose was out of joint, she never mentioned it again.
Fucking phew - that really was squeaky bum time. Needless to say, all down outside the house now!