What are the mnemonics that can be used to explain oxidation and reduction?

Here are two commonly used mnemonics for oxidation and reduction:

LEO the lion says GER

LEO: Lose electrons, oxidation

GER: Gain and electrons, reduction

and

OIL RIG

Oxidation Is Loss (of electrons), Redution Is Gain

Both of these mnemonics are reminders that a species loses electrons when it's oxidized and another species gains electrons when it's reduced. It doesn't seem like a gain should be called reduction, so think of it as loss and gain of negative charge. Electrons are negative. When negative charge is gained there's a reduction in positive charge. Here's an example:

Zn + 2 HCl -> ZnCl2 + H2

In this reaction, Zinc is oxidized because it goes from neutral to a charge of +2 by losing two electrons. The electrons went to the two H+ ions, which were reduced to neutral H2. Oxidation and reduction always occur together as the electrons are transferred from what's oxidized to what's reduced.