Within the Captain America: Civil War fight scene, Ant-Man uses his suit to grow to several times normal size.
Right before that, he says this:
I've got something kinda big. But I can't hold it very long... I do it all the time. I mean once, in a Lab. And I passed out.
Is he referring to a specific scene within the MCU? Failing that, is it an allusion to something that happened within the comics?