I put some Yoshido grips on my bullhorn today and went for a brief ride (got smokes). On the way back, i decided to try a skid in front of my house. The grips were loose-ish, but i figured the worst that could happen is they'd twist around a bit.
Instead, the right grip pulled off the bar in my hand and i fell down. No injuries, low speed, but yeah, don't be like me.
I know this invites "you dumb***" (deserved) replies, but it never occurred to me that loose grips could be a big deal on a fixed gear (had mine a month now). Consider this a dumbo PSA.