There are so many miscellaneous items you need in a recording studio. Many of them are pretty small and get easily tangled.
I find that clutter really screws with my head on a session. For instance, I use a lot of guitar pedals. Not at the same time, but different pedals for different sounds.
A lot of pedals come with specific power supplies. Nothing inspires screaming at the top of your lungs like trying to separate a bunch of tangled power supply cables.