Partway through the P'sukei d'Zimra section of the morning service is Psalm 100 (Mizmor l'Todah). Many, but not all, people stand for the recitation of this particular psalm. Prayer books vary, ...
For many a distressful situation (that should not come!), people organize a communal recitation of parts of the book of T'hilim (Psalms). In some of these, there is a leader, who recites each verse ...
I have seen people seemingly careful to sit down when beginning the paragraph of prayers that starts "Ashre yosh've vesecha" (Ps. 84:5). One such person told me that he was, in fact, careful to do so, ...