In Ireland? Probably outside any number of pubs on a Saturday night.
In the world? Depends on how reckless you are. Anywhere where there';s a war or ethnic conflict can be bad (unless you too are heavily armed). But have a look how many sharp knives there are in your kitchen! fall on one of those and it could do some damage.
My advice is to leave the dangerous places alone, but if you must go, here are some tips.
and this one
good luck about 6 years ago