handspring,
flip-flop, somersault, cartwheel, vault
turn
over, toss, flick, spin, overturn, reverse
lose
your temper, explode, see red (informal), go off the deep end, blow a
fuse (informal), go berserk, blow up (informal), hit the roof, lose it
(informal), go postal (US, informal), lose your rag (UK, slang), flip your lid
(slang), go ballistic (slang), go mad