Then said Utgard-Loke: Now I will tell you the truth, since you have come out of the burg, that if I live, and may have my way, you shall never enter it again; and this I know, forsooth, that you should never have come into it had I before known that you were so strong, and that you had come so near bringing us into great misfortune. Know, then, that I have deceived you with illusions.

[...]

When you drank from the horn, and thought that it diminished so little, then, by my troth, it was a great wonder, which I never could have deemed possible.. One end of the horn stood in the sea, but that you did not see. When you come to the sea-shore you will discover how much the sea has sunk by your drinking; that is now called the ebb.

- Prose Edda (The Fooling of Gylfe, XIV)