Alright so me and my friends were messing around until one of them got downed. When we revived him he went to Juggernog and bought it then lagged out while drinking it this blocked us from buying Jugs. We tried this with every perk and yes it sucks.

Stamin-Up:
Alright so this glitch is like the ascension one. You go to the corner of Stamin-Up and keep crouch jumping while others Sickle or Ballistic Knife You. After a couple of trys you should kind of breach out but mostly your back into the wall and your right or left side should be in the Stamin-up . While in the do not shank at zombies or it`ll push you out of the spot and zombies can hit you again.(Our you can get on top of the machine)

Flopper:
Same as Stamin-Up but try to get into the table by your team mates sickling you or ballistic knifing you and yes you can shank while in this spot.

(Takes a while to get it right)
(Its hard in Modded Zombies too)
Cant record Hd PVR Broke
+ Rep if you think the perk glitch is a game ruiner
Post GT Below I`m doing these glitches again tonight!!!
Edit:
Almost forgot i need a recorder!