Is it normal to occasionally have small spasms in my limbs?

Occasionally (maybe once a week) I have a what I believe to be a small spasm somewhere around my body (usually my arms/legs). I could more accurately describe these as my bent arm suddenly and involuntary straightens and I get goose bumps. I also think this might be linked with this thing that used to happen a lot, where whenever I heard certain sounds (biting an ice cream usually, but sometimes other things) I would get goosebumps and have a TINY spasm all over. Any explanations/theories?