Here are videos taken in class this after, ok i admit im a video noob.
When we inhale helium gas, we will have a few secs of chipmunks voice?? LOLS
The video u can hear more of laughter than the chipmunks voice -.-

<br/><a href="http://video.msn.com/video.aspx?vid=ab647671-53ad-4cc1-8351-8333d356742a" target="_new" title="Testing on Helium gas">Video: Testing on Helium gas</a>

<br/><a href="http://video.msn.com/video.aspx?vid=a680089c-be92-4d21-8cc6-6ba12db163b3" target="_new" title="helium gas">Video: helium gas</a>

&amp;amp;amp;lt;br/&amp;amp;amp;gt;&amp;amp;amp;lt;a href="http://video.msn.com/video.aspx?vid=6e85a6ad-2757-4052-9d65-a5d55ff1168a" target="_new" title="helium gas"&amp;amp;amp;gt;Video: helium gas&amp;amp;amp;lt;/a&amp;amp;amp;gt;

&amp;amp;amp;lt;br/&amp;amp;amp;gt;&amp;amp;amp;lt;a href="http://video.msn.com/video.aspx?vid=fd4e032d-d90f-4137-9eb4-c25a8f39f5cb" target="_new" title="helium gas"&amp;amp;amp;gt;Video: helium gas&amp;amp;amp;lt;/a&amp;amp;amp;gt;

&amp;amp;amp;lt;br/&amp;amp;amp;gt;&amp;amp;amp;lt;a href="http://video.msn.com/video.aspx?vid=9e628725-73a3-49f6-bcb8-a8ee0c56848a" target="_new" title="helium gas"&amp;amp;amp;gt;Video: helium gas&amp;amp;amp;lt;/a&amp;amp;amp;gt;

&amp;amp;amp;lt;br/&amp;amp;amp;gt;&amp;amp;amp;lt;a href="http://video.msn.com/video.aspx?vid=24eb3aa4-33ca-400c-a9f4-3ca5c0331bfb" target="_new" title="helium gas"&amp;amp;amp;gt;Video: helium gas&amp;amp;amp;lt;/a&amp;amp;amp;gt;

&amp;amp;amp;lt;br/&amp;amp;amp;gt;&amp;amp;amp;lt;a href="http://video.msn.com/video.aspx?vid=3f812144-afa4-40c6-946b-82b82d2d44d3" target="_new" title="helium gas"&amp;amp;amp;gt;Video: helium gas&amp;amp;amp;lt;/a&amp;amp;amp;gt;