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Usually at a green light I wait at least 10 seconds before using the horn, which is a lot when you wait 
Else I sometimes have to use it in roundabouts, when people think they have priority when entering in these.
This often happens here, near where I live:
http://maps.google.com/maps?f=q&hl=en&geocode=&q=place+simonis,bruxelles,belgium- &sll=50.863459,4.329882&sspn=0.001322,0.002969&ie=UTF8&ll=50.86345,4.3296&spn=0.- 001322,0.002969&t=h&z=19
Cars coming from the right think that the green light at the previous crossroads gives them a permanent priority or something like that, so they do not always pay attention to cars coming from their left in the (oval) roundabout.
Else I sometimes have to use it in roundabouts, when people think they have priority when entering in these.
This often happens here, near where I live:
http://maps.google.com/maps?f=q&hl=en&geocode=&q=place+simonis,bruxelles,belgium- &sll=50.863459,4.329882&sspn=0.001322,0.002969&ie=UTF8&ll=50.86345,4.3296&spn=0.- 001322,0.002969&t=h&z=19
Cars coming from the right think that the green light at the previous crossroads gives them a permanent priority or something like that, so they do not always pay attention to cars coming from their left in the (oval) roundabout.