And the rules are ...

1. Keep him out of sunlight

2. Don't get him wet

3. and no matter what, do not feed him after midnight !

Magwai (Gizmo), Quirón SA, Spain, 1983

Do not expose the Mogwai to bright lights or sunlight which will kill it, do not let it get wet, and never feed it after midnight...

Gizmo, maker ?, 1980's

Another classic coming straight from the 80ies...  The ultimate pet to have... or not...