For Kaitlin Olson and Rob McElhenney, looking back on their whirlwind romance will always be a sunny time. The couple first met when Olson auditioned for the role of Sweet Dee for McElhenney’s show, It’s Always Sunny in Philadelphia.

Rob McElhenney told his co-star Glenn Howerton he was dating Kaitlin Olson in the most It's Always Sunny in Philadelphia way, and Howerton's reaction was very Dennis like in the most hilarious way too.

"The stupidest thing you could possibly do is to date your co-star," Howerton said while recalling the start of McElhenney and Olson's romantic relationship