When he stands next to your girlfriend and says her hair smells nice.
A wind tunnel.
Because he's got rusty knees.
Because he had a reptile dysfunction!
Nothing. It's a gift she will always remember. Edit: Wording clarified (Thanks to therinnovator).
Their Punch.
With a drum machine you only have to punch the instructions in once
So they wouldn't fill up with gravel.
Conditioner Gordon.
Because they're ugly and smell bad...
Tacos. Overheard an old man telling another guy how he lost his farm in Mexico , and how the smell reminded him of tacos.
A little get together
Because he told a woman how nice her hair smelled.