Mark Edward Proksch (born July 19, 1978) is an American comedian and actor. He is perhaps best known for a series of pranks he pulled on television news stations under the pseudonym "Kenny Strasser" or, as he sometimes called himself, "K-Strass." Proksch contacted local news stations claiming to be a yo-yo expert.

When invited on the shows, he baffled interviewers with his long, incoherent monologues and his inability to perform a single actual yo-yo trick. Proksch's antics earned him a wide audience and made him a YouTube star overnight.