It's just so hard to pull out.
Because they pull out at the last second.
They both pull strings for work. (Inspired by Bo Burnham, this popped into my head the other day)
Because there are already too many targets. (credit: some old veteran bum looking guy sleeping on a bench at the police station I went to today.)
A Shia pet. *friend of mine came up with this and was pretty proud of himself
Both of them are hard to pull out of.