A hidden feature in PowerPoint lets you create fluid curves like this.

fluid curves
You need to draw a curve, freeform, or scribble to use this feature. Follow these steps:
- Insert a curve, freeform, or scribble by choosing AutoShapes> Lines on the Drawing toolbar. (In 2007, click the Insert tab and choose Shapes> Lines to find them.)
- Select the AutoShape.
- From the Drawing toolbar, choose Draw> Edit Points. (In 2007, click the Format tab and choose Edit Shape> Edit Points.) You now see the vertices displayed.
- Click on a vertex to display two handles on either side of the vertex.
- Drag the handles to create the Bezier curves, as you see here.

How to Create the Bezier Curves
You can also do the following:
- Add a vertex: Press Ctrl and click anywhere on the outline.
- Delete a vertex: Press Ctrl and click any vertex.
- Straighten a segment: Right-click along a segment and choose Straight Segment.
- Make a straight segment curved: Right-click along a segment and choose Curved Segment.
- Create a corner point: Right-click a vertex and choose Corner Point. This ensures a sharp corner.
- Create a smooth point: Right-click a vertex and choose Smooth Point. This ensures a non-sharp corner.
- Create a straight point: Right-click a vertex and choose Straight Point. This disallows a corner.
2007 only tip: If you have a rectangle or other shape, select it, click the Format tab, and choose Edit Shape> Convert to Freeform. You can then edit it as just described.
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