Walk up to them out of the blue. Declare their new hairstyle looks great. Tell them, no really, you always thought they looked nice, but WOW, their bangs are great. Seriously.

Because the best compliments are unscripted and spontaneous. A coworker (who always looks pretty nice herself) mentioned my new 'do yesterday, and it really lifted my spirits. Way more than a can of Mountain Dew did.

Now, if you really want to leave me speechless, tell me I'm smart ;)