The WSJ has an article at the intersection of 2012 gifting opportunities and unique trust provisions. I will repeat that the $5 million gift tax exemption for 2012 affords some people tremendous planning opportunities. Whether they want to make those gifts with unique strings attached i.e. attending the donor's alma mater, spelling the family name a certain way, or marrying within the faith, is possible (and too controlling - at least in these examples).
However, I include a clause in trusts for all of my clients that suspends distributions if a beneficiary has a drinking, drug, or gambling problem. n.b. fantasy football and a bottle of wine with dinner do not rise to that level.