Hi Monica
Excellent find - hard to verify that this is a true Censuswhack as I'm not able to search the 1891 census by occupation, but it seems as though, out of all the bucket workers in Warwickshire your ancestor was the only one blackening them!
And... in Wales in 1891, there is the lonely
BUCKET Kingston, born 1890 in Cardiff. Now that's a definate Censuswhack, so the points are yours! (Incidentally, poor Bucket was a girl

).
cheers
Paul