Mouthings tend to occur most often when signers are manually articulating nouns, open-class items, and morphologically simpler signs (see Crasborn et al. 2008).

All ye that, as I do, have felt this smart, Ye know how burthensome 'tis at my heart.

Every person who passes by is a potential customer.

As [Charles] de Gaulle's minister, he [André Malraux] was able to visit China in 1965 and to persuade the rather baffled Chinese authorities to grant him an audience with Mao [Zedong]. […] The meeting was brief and platitudinous, but in later accounts […] Malraux turned it into a major summit of great minds.