T-Mobile has made a habit of needling AT&T ever since John Legere took over as CEO but the company may have pushed things to a whole new level this week. AllThingsD reports that T-Mobile is suing prepaid AT&T subsidiary Aio Wireless because it’s allegedly using T-Mobile’s “trademark” magenta color in its logo. In its complaint, T-Mobile accuses AT&T of setting up Aio earlier this year as a way to counter its “UNCarrier” initiative and of trying to confuse consumers by giving Aio a magenta logo that it says is strikingly similar to the hue of T-Mobile’s logo.

“In early 2013, T-Mobile publicly disclosed plans to compete against the incumbent telecommunications providers in a new way: by offering telecommunications services without the need for consumers to enter into a two-year or annual service contract,” T-Mobile said in its complaint. “The dominant telecommunications provider, AT&T, responded by setting up a wholly owned subsidiary, Aio, which — out of all of the colors in the universe — chose magenta to begin promoting no-contract wireless communications services in direct competition with T-Mobile.”

If all this seems laughable to you, recall that Legere has in the past talked to a bunch of dolls during one of his press events to ridicule AT&T. Or put another way, nothing is too ridiculous for T-Mobile if the result annoys AT&T.