Our writing group has been learning to use wow sentence beginnings. To make wow sentence beginnings you can...
use descriptive language
use interesting words
use a variety of sentence beginnings.
Here are our examples,
Yahoo! As the crowd goes wild for the All Balcks team that just beat Tonga by miles. (David)
"Wahoo!!" I said as I bungee jumped off a cliff. (Kahu)
Wow, I couldn't believe my eyes when I saw a race car break up. (Bayley)