If you have a standard cocktail shaker and a hand-held cocktail strainer, you can make whipped cream in moments. This video from the folks at Panna shows you how.
The trick is fairly simple. Add a little thick cream to a cocktail shaker, then remove spring from your cocktail strainer and add it to the shaker as well. Pop the top of your shaker on, and give it a good shake for about 30 seconds.
Open it up, and you should have freshly whipped cream inside the shaker, easy as that.