So I try to have a little mental list of things that are quick and easy to make and don't take much prep or cleaning up. Sometimes these activites are a really big hit (sometimes not but they do acheive their purpose) and today was one of those days.
This activity the kids made themselves after I had explained what to do and then just ran away with it (and I got stuff done *gasp*).
It doesn't get simpler than rolling a piece of card into a cone and using it for a megaphone or for listening.
The girls were so excited that their voices could sound so loud (becasue they need help with that -riiiiiight) and they could also here very quiet sounds more clearly.
This fit into a senses theme that we were doing at the time also.