All of these in my high school chemistry class were melted.

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Snickers. I still remember we were filming our science projects in HS and Beth, the valedictorian no less, got caught putting a glass tube in her mouth (to 'blow' something apparently, I don't remember the experiment) that had just come out of the bunsen flame.

It was no sound film: she brings the glass tube to her lips, and gets a horrified look and her face and briskly removes it.

Later she said 'it just doesn't take me long to suck on a glass tube.'

(I made that last part up for the sake of the story.)

poor, stupid Beth.
:headshake

We called her Hotlips from then on.

(I made that up too.)

If it's hot, the beer will be boiling. ;)