I LOVE when people do activities at their parties - how fun would be a mad scientist theme party be?!? I would be pushing the kids out of the way to try the experiments! You can find tons of fun experiments to do online... so here are a few ideas for putting a little frosting on the party!
Source and recipe
petri dish and gummy worms! Make sure you have plenty of test tubes in racks and things around, as well! Source
Source and directions