" - huh. You know, I've never heard of anyone doing that, but it's got to be possible in theory, because dumber wizards generally have worse saves, and if nothing else you could curse yourself to prepare and cast the spell while substantially stupider, and given that that would work it's presumably possible to figure out what the dumber wizards are doing wrong and do it wrong on purpose. Though I think that'd be harder than it sounds, because we're talking about muscle memory, right, trained instincts for how to build a spell.
It also wouldn't work if the target had substantial experience with spells, because they could just notice the spell seemed sloppy."