ADDED: I arrived at that very retro site because I wanted a link for the "Yesterday!" in the previous post. I felt like I remembered Krapp exclaiming "Yesterday!," But the Beckett play with all the "yesterdays" — though not quite the exclamation I feel I remember — is "Waiting For Godot," which I figured out after buying, in Kindle, "The Complete Dramatic Works of Samuel Beckett," and doing a search.
VLADIMIR: We met yesterday. (Silence.) Do you not remember?
POZZO: I don’t remember having met anyone yesterday. But to-morrow I won’t remember having met anyone to-day. So don’t count on me to enlighten you.