on the edge of your seat

on the edge of your seat (or chair)

very excited and giving your full attention to something. informal
See also: edge, of, on, seat

on the ˌedge of your ˈseat/ˈchair

very excited and giving your full attention to something: The film was so exciting it had me on the edge of my seat right until the last moment.
See also: chair, edge, of, on, seat