I was following a van down a residential street that involved us going around parked cars and waiting for traffic coming round parked cars on the other side etc. The van slowly stopped behind a car so I assumed traffic was coming the other way but no he had just parked up without indicating. I realised as he got out the van and then smirked and winked at me. Without thinking I gave the finger and drove on, only to remember I was now a teacher at the infant school 100 yards down the road and was hoping he didn't see me turn into the staff carpark! I've been doing a lot of supply at different schools and forgot I needed to behave myself in this area, but the winking was so smug.