Seems like you can make really really really big subject names?
For example, under the current rules it is currently possible to make a thread titled:
testingtestingtestingtestingtestingtestingtestingtestingtestingtestingtestingtestingtestingtestingtestingtestingtestingtestingtestingtestingtestingtestingtestingtestingtestingtestingtestingtestingtestingtestingtestingtestingtestingtestingtestingtestingtes
With the way things are currently set up, it would be easily possible to break or convolute the way threads are presented in the list.