Thanks to Sara from Chicago for making me remember this.
Amoeba on a tightrope: ____.____
Amoeba on a tightrope with a pole: _____—.—______
Amoeba firing a gun: .—<
Amoebas on a walk: ...
Amoebas rowing: .,.,.,
Amoeba with pom-poms: *.*
Amoeba playing a bugle (or French horn): &. (or maybe it was @.)
Amoeba in a prison: #. _#
Amoeba wearing French cook hat: !
Amoeba with long hair on a windy day: ~.
Amoeba blowing up a balloon: .o
Amoeba finished blowing up a balloon: .O
Amoeba about to climb stairs: .H
Amoebas carrying a pipe: .—.
Amoebas carrying a coach: .=.
Amoeba carrying a magnet: .c
Amoeba shooting from a bow: .} → (.
Amoeba looking through binoculars: o.o
Amoebas in a middle of a circus act: .:
Amoeba conducting an orchestra: .'
Amoebas on a carousel: .T.
Amoeba with an antenna (or a slingshot): .Y
Amoebas on top of a hill: Ö
Amoebas on top of a tree: Ï
Amoebas on top of a carousel: .T̈.
Amoeba with long hair running with a pole: ~./
Amoeba holding up flairs (on a landing strip): '.'
Amoeba holding a sickle: ?
Amoeba in an elevator: [.]
There were also amoebas on a seesaw, but I can’t remember now. Sorry.
Feel free to add.
(Apparently, some of these work better in simpler fonts.)