“Johnson once shaved off the hair on his arms to see how long it would take to grow again.”
This is from Julia Allen’s Swimming with Dr Johnson and Mrs Thrale, reviewed recently in the Times Literary Supplement (TLS): http://www.the-tls.co.uk/tls/public/article1255863.ece
On the dullness scale, this is up there along with watching paint dry and grass grow. But not in the same league as watching trees grow and the pitch drop fall.
The review comments on Johnson’s persistence, clearly a hallmark of a dull man. He spent years researching even the most mundane of words. His sentences were monotonous.
Should we establish a page for Postmortem Dull Men?