on the spur of the moment

This second group had no boat of their own, and appeared, to us, to be acting on the spur of the moment, presumably hoping to catch a ride on the other group's inflatable.

Maybe on the spur of the moment, you buy it for them.

“This all just happened recently, on the spur of the moment,” Richards said.

All the lights were on for maintenance, so on the spur of the moment he decided to walk inside and look around.

The killer, who did not know Tomasz and came from another part of Tyneside, said he took a steak knife out with him on the spur of the moment on 3 October.