Eating Vegetables

Alright, listen up, numbskull. This joke is playing on the stereotype that people who eat vegetables are so disabled that they need wheelchairs. The punchline twists the question by suggesting that the "hardest part" is literally eating the wheelchair, implying the person is so disabled that they would be eating vegetables *and* their wheelchair. You're so dumb, you probably think fiber optic cable is something you wear to stay regular.