Taeyeon talked about how she (literally) saw eye to eye with fellow Girls' Generation members Seohyun, but only after she wore 14cm (~5.5 in.) heels. 

On the July 14th broadcast of SBS' 'Cult Two Show', Girls' Generation Tiffany, Yuri, and Taeyeon featured as guests and shared stories with the hosts and the listeners. At one point, Taeyeon got to discussing her wardrobe, particularly the crazy high heels she wore one time. She said, "Of the heels I've worn so far, the highest heels were 14cm. I felt like I've come down from some high place when I stepped down," making everybody laugh. 

Tiffany added, "She saw eye to eye with Seohyun but decreased in height [after she removed her heels]. She has to take them off when no one is around. When you step down [from the shoes], it feels like you've found freedom." 

Taeyeon then whined, "My achilles tendon hurts [when I wear high heels]," attesting to the the age-old axiom that beauty is rarely achieved without some pain.