Examine this comment:
https://secure.phabricator.com/T9360#143554
At first it appears the comment is dancing, livened by @chad's singing.
It looks like when the apostrophe immediately proceeds an 'm', 'o' or is immediately proceeded by an 's', 'm', or 'o'. There might be other characters it doesn't go well with. I haven't checked capital letters.
figlet{{{I'd be o'k oops}}}
figlet{{{I'm ok}}}
figlet{{{mI' is ok}}}
figlet{{{'skipping}}}
figlet{{{'misteri}}}
figlet{{{' misteri w'onster b'oo}}}