This might make you feel bit better.
I did an oil change on my CB750. Flushed and drained the engine, filter off, new one in, cover done up nice and tight. Poured in the fresh oil, and poured, and poured, and poured . Noticed oil all over the floor, bent down to look at the filter cover, noticed the sump plug wasn't in place. I'd only forgotten to replace it after I drained the engine .
And yes, Her indoors had about as much sympathy (fell about laughing and told all my mates).