Whistle mimic

We were at the table tonight and I don't remember the circumstances, but I let out a cat call whistle; you know the one that is stereotyped of construction workers when a pretty girl walks past. Well, Sam then went "Woooooohoooooo" to the same cadence and made a pretty good mimic of the sound without actually whistling. It was pretty funny and I was laughing so hard I could hardly whistle to get him to do it again. We tried to get a video of it, but it just wasn't the same as the first time. Will post what we got or if we can get him to do it on camera like he did the first time.