Of course! Domestic accidents are still among the most frequent causes of injuries, and besides cutting one's finger in the kitchen, bruising one's finger with a hammer is "not unusual" - lol. I had often minor accidents with tools, including hammers, but usually, with a plaster or a bandage the job could be completed.
And that reminds me of an old joke:
Little Johnny comes downstairs crying. His mother asked, "What’s the matter now?" "Dad was hanging pictures, and just hit his thumb with hammer," said little Johnny through his tears. "That’s not so serious," soothed his mother. "I know you are upset, but a big boy like you shouldn’t cry at something like that. Why didn’t you just laugh?" "I did!" sobbed Johnny.
http://unijokes.com/little-johnny-jokes/7/