At A Time Like This
(actions in brackets)

At a time like this
At a time like this
At a time like this
Oh I need someone to help me

Actions: After each "At a time like this" you do the action twice, & after the last line, you only do it once. First time through you clap twice:

At a time like this (clap clap)
At a time like this (clap clap)
At a time like this (clap clap)
Oh I need someone to help me (clap)

Then you add the next action: oogah oogah (spoken while holding your fists clenched at elbow level, pulling back horizontally on the "oo" part):

At a time like this (clap clap, oogah oogah)
At a time like this (clap clap, oogah oogah)
At a time like this (clap clap, oogah oogah)
Oh I need someone to help me (clap, oogah)

More actions:

Third verse: tap tap (spoken while clapping your own hands in "gimme five!" fashion e.g.: one on top of the other, then the other on top)

Fourth verse: nannu nannu (what Mork from Ork used to say on Mork & Mindy) spoken while putting your arms out either side Egyptian style (walk like an Egyptian)

Fifth verse: ping ping (spoken while patting your head with 1 hand)

Sixth verse: whoosh whoosh (spoken while flipping your hand back & forth over your head)

Seventh verse: Whoa (pause) whoa (pause) (spoken while twirling an imaginary lasso over your head)

Eighth verse: The last action is "TA DA!" with arms outstretched. By then you should be singing:

At a time like this (clap clap, oogah oogah, tap tap, nannu nannu, ping ping, whoosh whoosh, whoa whoa, TA DA!)
At a time like this (clap clap, oogah oogah, tap tap, nannu nannu, ping ping, whoosh whoosh, whoa whoa, TA DA!)
At a time like this (clap clap, oogah oogah, tap tap, nannu nannu, ping ping, whoosh whoosh, whoa whoa, TA DA!)
Oh I need someone to help me (clap, oogah, tap, nannu, ping, whoosh, whoa, TA DA!)