Read the instructions

(JH comes in after being off sick for a few days, EM knows just the thing to cheer her up)

EM: You know these tablets (points to the box of barocca)
JH: yeah
EM: JJ has never had them before
JH: has she not?!
EM: no... She had one yesterday but didn't know what to do with them do she ate it...
(JH laughs so hard she starts coughing)
JH: they say effervescent on the box!
EM: maybe that's what she thought they would make her feel
JH: oh god! Thanks for that! That's cheered me up no end!
EM: when I came in here she told me what happened but she had it in a cup so I don't know if she spat it out into some water...

(later on)

JH: I asked JJ about it and she said she thought she was having a fit because she was foaming at the mouth!
EM: REALLY?!
JH: yeah!
EM: oh my god!