Science joke

One of my all time favourite groaners… (my apologies in advance)

Werner Heisenberg is pulled over after proceeding far too briskly in a built-up area. The traffic officer walks over and asks, " Sir, do you have any idea how fast you were going?" Heisenberg replies:" Sorry, no officer. But I know exactly where I am!"

Aha. Took me a while, since I’m not too familiar with the name.

M’not shober. groaaaan.