So at this müffeligen Pupspäckchen is definitely a world-class fun stuff. Have you nicely applied every now and then and 'brought to amaze with such' 'attacks' some people. =) You press them together, there is a chemical reaction inside it, and after about 10 seconds bursts on all the fun and stinks like rotten eggs Höllig. A proposal on my part; wrap in pulp handkerchief because the stuff injected, causing smelly stains! But as I said, for pranksters, have the joy of stupid and unsuspecting faces, Highly Recommended.