Footshake

You can give a handshake. Can you give a footshake too?

Assorted aliens awaiting their use of the facility slithered away politely as Chap Foey Rider made his way to the door, exchanging an occasional nod or footshake with rather less than his usual urbanity.

When the parrot is raising its foot consistently when given the cue, grasp its foot and shake it. Bridge and reward. When the last step has been accomplished, bridge and reward only after handshake (footshake!) has been properly completed. At this point, do not reward for merely lifting the foot.

Like when I see / a couple of jocks in my health class / doing the secret footshake.