No,It is true the price does spike on the Gox via "Last price" to over 17.I have seen it myself a few seconds ago.
It's some coding error in the script that updates the prices in the browser. Gox has never fixed it, but they've been notified before about it.
I think the "last price" is also updated from the EUR and other markets on gox. EUR is currently pretty high (higher than USD).
EDIT: mtgoxEUR high is €12.73 ($16.95), so what I said doesn't make sense.
EDIT2: 10.85 BTC (mtgoxGBP high) = 17.17 USD