Secondary science teachers - do you have a fail-safe fun lesson?

[anchovies]

I have just finished my PGCE and am going back to my placement school tomorrow to teach a year 7 class a one off lesson. I have promised them something fun!

Was thinking of doing an egg drop challenge but was wondering if anyone has any fantastic fun lessons that they could share?

TIA!

[reallyneedmoresleep]

Bit late now, but my Y6 really enjoyed building a structure out of marshmallows and spaghetti.

[mumsneedwine]

Making slime. Discussing how it acts as a liquid and a solid. And how it looks like bogey if use green food colouring. My local hardware store always get me the borax.

[mrsnewfie]

Flame tests!