20. Alyson Hannigan Refused To Kiss Jason Segel Unless He Quit Smoking
On screen kisses can be a big ask. And all that would be made worse if the other person tastes like an ashtray, which is exactly the situation Alyson Hannigan found herself in when she first started on How I Met Your Mother.
Jason Segel was a long-term smoker, making her numerous kisses with him a daunting prospect. Putting her foot down, she insisted he try and quit to make the whole ordeal bearable. Segel originally tried using a fine system where he'd pay Hannigan $10 for every cigarette he smoked. When that racked up a large debt, he instead decided to go cold turkey, which worked. For a year at least.
Apparently due to stress he relapsed, meaning gum must have been on hand through much of the show's run.