I think some definitely like the adrenalin rush and terrifying their keepers
is probably part of the fun. lol!!
You'll just have to make sure there's nothing too hard and sharp in the
cage. I'm assuming that it can't hurt the wee mite or he wouldn't do it
again.
My last 2 syrians were definitely thrill seekers. When staying at my
sister-in-laws she put a large bolster across the kitchen door to stop them
"falling" down the 2 steps into the kitchen. Within minutes the little
monkeys learnt that if they ran at speed in their playballs and rammed the
skirting board at just the right spot they could bounce over the bolster.

)