Boing Machine

Uh! I found a shiny metal doorstop stuck down near the floor! I pulled it back with both hands and let it go—BOOIIIING! It made the loud wiggly noise right in my ear! So I did it again, flick flick flick! Then I tried clamping a big plastic ruler against the low table edge to see if it would do the boing too, and THWACK, it bounced right off my helmet! Uh! Best noise machine ever, gonna flick it fifty more times!