From the BBC:

Celebrities have been asked to check their facts before lending support to scientific research and campaigns, rather than risk misleading people.

Some celebrity-backed campaigns have done more harm than good, such as linking the MMR jab to autism, says the charity Sense About Science.

Seems like a worthy sentiment. Then comes this:

[An advice pamphlet] offers advice such as “if it sounds too good to be true, it usually is”, and lists a phone number for concerned celebrities to call if they want to discuss anything with experts.

A helpline for celebrities requiring scientific advice. For some reason I find this incredibly funny.