Herpes. Hopes it's the same in English. They don't have it in my lexicon <img src="/ubbthreads/images/graemlins/suspicion.gif" alt="" />. According to the Lexin Swedeish-English lexicon (online, official schoollexicon in Sweden) it's the same though.

Übereil

Brain: an apparatus with which we think we think.

Ambrose Bierce