It is the day after the party, you are nauseous and your eyes hurt like hell! What happened? Were you drugged?

No, you just got your first cheap foam party experience.

Arranging a party? Read this first
Household soap or detergents should not be used to generate party foam, because they are not pH-neutral and often contain protein-dissolving enzymes. If they are used at a foam party, the foam will cause serious eye and respiratory system irritation. The exception is Johnson & Johnson brand baby soap, which is non-irritating to the eyes and mucous membranes; unfortunately it is not cost-effective for large parties. Reputable foam party companies use special non-toxic, non-staining, hypo-allergenic solutions to generate their foam.

Going to a foam party?
Use some common sense. Do not roll around on the floor like you are having a seizure. That is the recipe to attract nasty bacteria and get cheap foam in your eyes. Bring some glasses to look cool while you protect those eyes.

Sources:
Wikipedia: Foam party