He was suffering from boredom, the security guard would let him grind his favorite spot on his what?\nOptions:\n- meet interesting people\n- listen to music\n- deck\n- play cards\n- skateboard
Let's think now! Step-by-step reasoning:
User
Grinding is an activity that is performed using a skateboard. Skateboard is a thing. Grinding on a skateboard involves sliding on it.
So, the final answer is skateboard.
Assistant