Typically, this form of cognitive impaction is self-resolving. However, in cases where productive interchange with the afflicted is urgently needed, a deadline may be administered; indeed, this has proven to be one of the most effective treatments for stubborn cases of mental constipation.
Dave: "Yeesh. It's too bad that they don't make a laxative for mental constipation!"
Person 2: Uhh...34?
Person 1: ...what?
Person 2: Sorry, I'm suffering from mental constipation