A bonding agent.
You don't have to pay for the glue to sniff...
Glue a penny to the bottom of a swimming pool ALTERNATE ENDING: Put a scratch n' sniff at the bottom of a swimming pool
They go to Cannes
Me: "It's water." Cop: "This is wine." Me: "What! That Jesus! He did it again!"
The noble gases, because they can't form bonds
Chemistry, because he knows a lot about bonds!