Definitely German- 5 years wasted on that **** and I can't even speak it decently well (it's a wonder I got an A* in one of my speakings!)
Also Physics- it was just too confusing and chronically boring yet fortunately I didn't do the entire course as I only did OCR Additional (radioactivity was still fun though).
ICT- we were forced to take it but I enjoyed Activity 3; it became really fun towards the end when the teacher finally realised we were a completely different bunch of students to the ones she had in her previous school.
I gave up most of the lessons I despised in Year 9 so I had a relatively enjoyable GCSE experience. My biggest mistake was definitely Art, but I still enjoyed it: the teacher was lovely and it was a great atmosphere. It was just a bit annoying when the two other people on my table were getting A*'s with flying colours and I was stuck on a C.
I've already ditched most of the subjects I hated(DT, Music, Latin, RS, History, Geography). It'll be hard for me to choose A-Levels(If all goes well with my GCSE's) xD