&quot;Not sure if trying to &quot;trap&quot; the liar is always the right way to go.&quot;<p>Agree almost never the right thing to do. Trapping people makes them dig in their heels typically as opposed to giving them a graceful way to give you what you want. All of this is situation specific of course but as a rule I never call people out on their lies in negotiation.<p>&quot;Once I had to work with a freelance web master and we were trying to cancel his contract and make him transfer the domain name to us (an association I was working for).&quot;<p>Honestly, best way to handle this type of things is to go the &quot;scary lawyer letter&quot; route. Try nicely (without threatening) and if that fails get an attorney to write the &quot;scary lawyer letter&quot;. At that point the idea of actually getting some money (rather than having to hire an attorney to defend a verbal contract) would seem very attractive.  There are other methods that can be employed (UDRP, trademark law) however they are more expensive and depend on the specifics.