The Trick Dispensing Machine dates from about 1980, and it was made in Hong Kong by a company that made quite a speciality in designing toys that squirt you!
Having filled the resevoir with water (or possibly something stronger!) you can push down on the lever and it will actually dispense liquid into the little clear plastic cup. Magic!
However, you then hand it to someone else to try, having unobtrusively flicked the switch on the back. When they try the machine, instead of dispensing liquid into the cup, it squirts the operator in the face!