I was looking at that ECG trace and wondering how many non-medicos would see what is going on. So here are some helpful annotations:
View attachment 499833
Note that QRS complex just before the R on T is a bit widened, but it's not a delta-wave because the PR interval is normal. OTOH the complex labelled "Short PR interval" does have a delta-wave implying existence of a re-entry pathway. If it was a real trace I would be pretty confused, but thankfully it's not
Many years ago, when I was a young resident, the wards would compete with each other to hang Christmas decorations. Then one year, a plastic bauble fell off and hit another staff member on the head. And that was it - OH&S banned all festive decorations, just like that!