This month's allotment of not-Far Side Cow ads is easier than previous entries, since not many of them have captions in them.
The one ad that does have text is rather self-explanatory in itself:
Why should I??
'Tis naught but a birthmark!!
The other exception being this comic below:
...which I scanlated for someone else a long time ago. I would've done the others, but was too lazy to get around to doing it.
Last but not least is what I consider to be the definitive of Paul Brazeau's Milk Ads.
In closing, the penultimate of the UFO Labatt Bleue beer ads.