Correcting a 'correction'...

On Friday a Rabbi popped round with his Sefer Torah with one of the oddest errors I've come across. In the very last amud the word Vaya'al (vav yud ayin lamed) read Yaya'al (yud, yud ayim lamed). Nothing odd about that I hear you cry - after all the bottoms of vavs can often wear away and so resemble a yud. Nope. This vav had been scraped away deliberately - you could see the marks on the parchment (see below) and then the regel (leg) drawn curvey and with an okets (thorn). Someone had corrected a letter that was correct! So I corrected it back to what it was supposed to be!

How odd.