This plant bothers me too, I even cannot decide to which family it belongs to start search. Very small greenish flowers, later would be fruits(I lost pictures of fruits), small green round, later they would break and show some bright orange seeds, reminding euonymus
Re: Unknowmn to me bush ot tree I found last year pictures with fruits. Pictures taken at the end of July, I didn't find latest one, with more colored fruits, which I remember I took in November
Maybe, Celastrus: http://www.illinoiswildflowers.info/trees/plants/or_bittersweet.html http://www.pittstate.edu/department/herbarium/woody/Celastrus_scandens_AmericanBittersweet.dot
I think my plant looks like from Celastraceae family. I would look close again. It is growing next to fence with Lonicera, but I didn't see it as a vine. Bush or small tree. Anyway I look again. Description looks similar. I have at my collection Celastrus orbiculatus, I am not sure if I identified it myself, what can be wrong or it had tag. Pictures taken in Japan November,5 I didn't see so many fruits on local plant and red was not so obvious, I just broke it and looked what was inside, something orange and seeds, maybe they didn't have time to mature