Weird Twang/Springlike sound switching from reverse to drive

Hi Everyone. I just heard a strange twang or springlike boing coming from what i think is the front of the car/engine after backing out of a driveway and then going forward in drive. Is this normal? I just bought my car yest...a used 2013 Prius c with 35k miles and out of warranty. Any ideas? I saw on the Nissan Leaf forum that it has a similar sound and its the abs system doing a check maybe. The prius c manual says the abs system may make a sound, but doesn't say what sound or when it happens. Thanks for your help!