I think you have to be a little warped to really handle mutlitasking, and I manage to have that kind of warp. Job before last I (actually, I and another guy) managed to max out a server with 256 cores and 384GB of ram, allowing the process to finish in only 24hrs instead of the previous "never finished". I was kind of fun and involved some really heavy hacking of Java hashmaps and threading. Last job involved some weird mixes of calling perl scripts who exec'd C code, all from Java as well and happening through ssh. I figured it was time to go when that made sense.