“Merry” is an adjective. “Let’s,” as in “let us,” as in “permit us to,” demands a verb. Presumably, this slogan represents some effort to make a pun. The effort fails. Would Starbucks write, “Let’s funny” or “Let’s delicious”? Apparently, Starbucks would. Customers ought to be concerned: Word play at the expense of grammar is not play at all. It’s antisocial.

I love this guy. (link via XQ)