Ruger LCP. Hate shooting that gun! Works fine, nice in the pocket, on the very rare occasion it is carried. Just hits me in all the wrong places when I hold it, even with the Handall grip.
Distant second, Ruger LCR with some hot 38 Specials. Changing grips helped some. Wife refused to shoot it more than once.
Just so it's not thought that I have Ruger bias, I have 357 Blackhawk that is sweetheart even with full load 158 hunting loads.