Once..on my bday...shift to doggy with a now retired reg - lady grabs it and points it into her arse...I say "sorry I didn't put in the upcharge in the envelope (she was 100 for greek) and she said "it's your birthday, it's on me"When I'm pounding the puss in doggy and she looks back and says 'put it in my ass now, baby!' Always adds about 100PSI to my little buddy's operating pressure.