Purposely slamming your elbow against any thing hard then masturbating with the hand from the same arm while it tingles.
"Why is your elbow black and blue?"
"I needed that extra bit of excitement while beating off last night and overdid a funny boner."
Performing a Funny Boner with your non-dominant hand.
"I got tired of using my right hand so I tried a stranger. After that got boring, I slammed my elbow against my desk and whacked away."
"Ah, The Neighbor. Why were you masturbating in your office?"
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