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Imagine if they tried this at Denny’s:

A French-born Manhattan resident claims a trendy SoHo restaurant tacked a gratuity on his bill without telling him — then said it was to “protect” the waiters because foreigners don’t tip.

Ludovic Audesson, who was dining with three European visitors, almost choked on his Sancerre when he got the check at posh Aquagrill.

“It’s the first time this has ever happened to me,” said Audesson, 32. “I think it’s very disrespectful. It is insulting to me.”

It’s more than insulting — it’s also illegal.

The city Department of Consumer Affairs prohibits restaurants from adding tips onto whatever tables they feel like.

Its rules state that a restaurant can impose a 15 percent gratuity on parties of eight or more as long as it conspicuously prints the policy on the menu.

Audesson’s party of four had dinner at the Spring Street eatery last month.

Everyone ordered their meals in accented English, then sat back and gabbed in their native tongue.

They enjoyed a leisurely, two-hour meal, complete with a bottle of white wine, some raw-bar shellfish, four fish entrees and three side orders.

The bill was $247.32 — including an 18 percent tip.

Audesson, a hair colorist at Pierre Michel, said when they asked the manager why the gratuitous gratuity was tacked on, he was told, “We do that because you’re foreign, and foreigners don’t tip.”