A post made by Sen. Elizabeth Warren, D-Mass., this week quickly became a punchline online after she warned that a proposed $45 billion deal bringing some of America’s best-known condiment and food brands under one roof could drive up grocery prices even further. The merger would combine McCormick brands such as Cholula and Frank’s RedHot with Unilever Foods products including Hellmann’s and Knorr. Warren argues the deal could weaken competition and leave shoppers with fewer choices. Users online joked about Warren cautioning against "Big Condiment." "One company could soon control them all," Warren said of four popular condiments. "I have...