Shirt chewing year (age 5)...we walked to school (pushing younger brother in stroller-letting him do it) while chewing gum (spit out gum before the crossing to school). Stroller was bigger than he was.

Next year, he homeschooled and he chewed gum anytime he felt the need to chew his shirt and the whole day was so flexible that the shirt chewing just kinda faded away.