Caribou Coffee! The coffee made by 'bous, for 'bous, that turns you into a 'bou too!
I'm not entirely sure how widespread they are nationally/internationally, but there's a real coffee brand called Caribou Coffee that has a couple of chain coffeehouses in my area and can be found in most grocery stores. Having both a reindeer sona and a totally-very-mild caffeine problem, I got the silly idea of mixing the two stuck between my antlers a while back and had to see it through.
Also I do enjoy their coffee and they're one of my regular brands, and there's a running joke among certain friends that Lus is always spiking the office coffeemaker with deer TF serum, so it fits. :P
And just in case there's any ambiguity; I have no affiliation with the company, and everything here is intended an affectionate joke; their products will not turn you into a caribou.