Yes, but purely for safety reasons. You see, the average human instinctively recoils at Comic Sans, and so by displaying it on the sign, it increases the chance of the sign dissuading potential field runners. Why, at this very moment there is a bill in congress to mandate that all precautionary statements be written in Comic Sans.

You're kidding, right? By causing that recoil action, it increases the likelihood of the sign not being read at all by 74%!