‘What action did Bloom make on their arrival at their destination?
At the housesteps of the 4th of the equidifferent uneven numbers, number 7 Eccles street, he inserted his hand mechanically into the back pocket of his trousers to obtain his latchkey.
Was it there?
It was in the corresponding pocket of the trousers which he had worn on the day but one proceeding.
Why was he doubly irritated?
Because he had forgotten and because he remembered that he had reminded himself twice not to forget.
What were then the alternatives before the, premeditatedly (respectively) and inadvertently, keyless couple?
To enter or not to enter. To knock or not to knock.
A stratagem. Resting his feet on the dwarf wall, he climbed over the area railings, compressed his hat on his head, grasped two points at the lower union of rails and stiles, lowered his body gradually by its length of five feet ten inches of the area pavement, and allowed his body to move freely in space by separating himself from the railings and crouching in preparation for the impact of the fall.’
[James Joyce, Ulysses, p.779.]