I believe there are two things that can reach temperatures rivalling that at the core of sun and each catches me out.
The first is the coffee or tea served in polystyrene cups at football grounds. They also put a cover on it to "stop it going cold". You'd need to blast it to the far reaches of the solar system to get enough heat out of it to make it drinkable.
The second thing is when you use a toastie maker and decide to have either a Jam or cheese toastie. Unbeknownst to the average user, the toastie maker actually turns the contents of your toasted sandwich into molten lava, which not only burns your mouth but on occasion, can eat through it and the tiled floor upon which it falls.
just thought would let you know am about to do the hot pizza burnt mouth one!!!!
the sitting in the back garden with the sun at its hottest (well hotest for birmingham anyway). then saying "i'll only sit out for 10 mins.. dont need the sun tan lotion".. then 90 mins later waking up with a slightly red chest.. then as the evening progresses that chest goes through that transition from Mildly red.. to lobster red. and no matter how red it gets you still fore go the Aftersun, thinking it wont hurt that much.....