To really impress that "cute girl", how about *speaking binary*?

Twenty-eight could be spoken in several cool ways. Here they are in order of difficulty and reverse order of coolness:

"sixteen and eight and four",

"sixteen eight four",

"two to the fourth two cubed two squared",

"ri eight four",

"ri mi ni".

Here's a free access article about it:

If that is too deep for you, here is a shallower end of the same swimming pool:

My favorite activity is learning new things.