Well why should you even need to "loosen up" your pledges??! Our pledge period is fun, and the girls love it. The only thing they get stressed about is the membership exam (a national requirement). All the other stuff we do is fun.
I can't even believe you would even CONSIDER doing that to your pledges. Scaring the crap out of girls you call sisters, and then laughing in their faces, doesn't sound very sisterly to me.
I'm just glad when I pledged SAI that my sisters respected me a little more than that.