Anticlimax

Anticlimax, as opposed to Climax (q.v.), is the addition to a statement of a particular which, instead of heightening the effect, renders the whole ludicrous: nearly equal to Bathos (q.v.). Thus: 'He was eminently truthful in all things. I do not believe he would have told a falsehood, even on his oath' (Hodgson's Errors in the Use of English, p. 217).