  We study the Euler equations describing the motion of an incompressible fluid
on the cubic torus with real initial data. We construct solutions on the
Fourier side which display a sudden loss of regularity within finite time even
for highly regular initial data. Moreover, the solution may regain its initial
regularity within finite time. This loss of regularity may coincide with the
appearance of a certain type of multifractal scaling of the solutions.
